diff --git a/d14.cc b/d14.cc
new file mode 100644
index 0000000..ec49dce
--- /dev/null
+++ b/d14.cc
@@ -0,0 +1,213 @@
+#include <iostream>
+#include <vector>
+#include <complex>
+
+//#define ANIMATE
+
+using namespace std;
+
+enum Tile {
+    EMPTY,
+    ROCK,
+    SAND
+};
+
+struct Input {
+    vector<vector<complex<unsigned>>> rocks;
+    vector<vector<Tile>> map;
+    complex<unsigned> start;
+    complex<unsigned> size;
+};
+
+void make_map(Input &input)
+{
+    // Figure out map extremes
+    unsigned min_x = 500, max_x = 500;
+    unsigned min_y = 0, max_y = 0;
+    for (auto &rock : input.rocks) {
+        for (auto &p : rock) {
+            if (p.real() < min_x) min_x = p.real();
+            if (p.real() > max_x) max_x = p.real();
+            if (p.imag() < min_y) min_y = p.imag();
+            if (p.imag() > max_y) max_y = p.imag();
+        }
+    }
+
+    input.start = {min_x, min_y};
+    input.size = {1 + max_x - min_x, 1 + max_y - min_y};
+
+    input.map = vector<vector<Tile>>(input.size.imag(), vector<Tile>(input.size.real()));
+
+    for (auto &rock : input.rocks) {
+        complex<unsigned> p = rock.at(0);
+        input.map[p.imag() - input.start.imag()][p.real() - input.start.real()] = ROCK;
+        for (unsigned i = 1; i < rock.size(); i++) {
+            complex<unsigned> &np = rock[i];
+            while (p != np) {
+                int dx = np.real() - p.real();
+                int dy = np.imag() - p.imag();
+                if (dx > 1) dx = 1;
+                if (dx < -1) dx = -1;
+                if (dy > 1) dy = 1;
+                if (dy < -1) dy = -1;
+                p += complex<int>(dx, dy);
+                input.map[p.imag() - input.start.imag()][p.real() - input.start.real()] = ROCK;
+            }
+        }
+    }
+}
+
+Input parse()
+{
+    Input data;
+    for (string line; getline(cin, line);) {
+        vector<complex<unsigned>> cur;
+        unsigned pos = 0;
+        for (;;) {
+            unsigned first = pos;
+            unsigned first_end = line.find(",", pos);
+            unsigned second = first_end + 1;
+            unsigned second_end = line.find(" -> ", pos);
+            pos = second_end + 4;
+            if (first == first_end || second == second_end) break;
+            unsigned real = stoi(line.substr(first, first_end));
+            unsigned imag = stoi(line.substr(second, second_end));
+            cur.push_back({real, imag});
+        }
+        data.rocks.push_back(cur);
+    }
+    make_map(data);
+    return data;
+}
+
+#ifdef ANIMATE
+#include <fstream>
+unsigned render_frame = 0;
+void render(const vector<vector<Tile>> &map)
+{
+    char fname[] = "img/00000.pam";
+    sprintf(fname, "img/%05u.pam", render_frame++);
+    auto file = ofstream(fname);
+    file << "P7\n";
+    file << "WIDTH " << map.front().size() << '\n';
+    file << "HEIGHT " << map.size() << '\n';
+    file << "DEPTH 3\nMAXVAL 255\nTUPLTYPE RGB\nENDHDR\n";
+
+    for (unsigned y = 0; y < map.size(); y++) {
+        for (unsigned x = 0; x < map.front().size(); x++) {
+            uint32_t color = 0;
+            switch (map[y][x]) {
+            case ROCK: color = 0xFF0000; break;
+            case SAND: color = 0x00FFFF; break;
+            default: break;
+            }
+            file.write((char *)&color, 3);
+        }
+    }
+    file.close();
+}
+#endif
+
+complex<int> dirs[] = {
+    {0, 1},
+    {-1, 1},
+    {1, 1}
+};
+
+unsigned p1(const Input &input)
+{
+    auto map = input.map;
+
+    const complex<int> sand_start(500, 0);
+
+    unsigned count = 0;
+    for (;;) {
+        bool oob = false;
+        complex<int> sand = sand_start - (complex<int>)input.start;
+        for (;;) {
+            bool moved = false;
+            for (auto &d : dirs) {
+                complex<int> test = sand + d;
+                if (test.real() < 0 || test.real() >= (int)input.size.real()) oob = true;
+                if (test.imag() < 0 || test.imag() >= (int)input.size.imag()) oob = true;
+                if (oob) break;
+                auto tile = map[test.imag()][test.real()];
+                if (tile != EMPTY) continue;
+                sand = test;
+                moved = true;
+                break;
+            }
+            if (!moved) {
+                if (!oob) map[sand.imag()][sand.real()] = SAND;
+                break;
+            }
+        }
+#ifdef ANIMATE
+        //render(map);
+#endif
+        if (oob) break;
+        count++;
+    }
+    return count;
+}
+
+unsigned p2(const Input &input)
+{
+    auto map = input.map;
+
+    map.push_back(vector<Tile>(input.size.real(), EMPTY));
+    map.push_back(vector<Tile>(input.size.real(), ROCK));
+    complex<int> start = input.start;
+    complex<int> size = input.size + complex<unsigned>(0, 2);
+
+    const complex<int> sand_start(500, 0);
+
+    unsigned count = 0;
+    for (;;) {
+        complex<int> sand = sand_start - start;
+        if (map[sand.imag()][sand.real()] == SAND) break;
+        for (;;) {
+            bool moved = false;
+            for (auto &d : dirs) {
+                complex<int> test = sand + d;
+
+                // Widen the map
+                if (test.real() < 0) {
+                    for (auto &x : map) x.insert(x.begin(), EMPTY);
+                    map.back().front() = ROCK;
+                    start += complex<int>(-1, 0);
+                    test += complex<int>(1, 0);
+                    size += complex<int>(1, 0);
+                } else if (test.real() >= size.real()) {
+                    for (auto &x : map) x.push_back(EMPTY);
+                    map.back().back() = ROCK;
+                    size += complex<int>(1, 0);
+                }
+                if (test.imag() < 0 || test.imag() >= size.imag()) continue;
+
+                auto tile = map[test.imag()][test.real()];
+                if (tile != EMPTY) continue;
+                sand = test;
+                moved = true;
+                break;
+            }
+            if (!moved) {
+                map[sand.imag()][sand.real()] = SAND;
+                break;
+            }
+        }
+#ifdef ANIMATE
+        render(map);
+#endif
+        count++;
+    }
+
+    return count;
+}
+
+int main()
+{
+    auto input = parse();
+    cout << p1(input) << endl;
+    cout << p2(input) << endl;
+}
diff --git a/d14_anim.webm b/d14_anim.webm
new file mode 100644
index 0000000..1123fd8
Binary files /dev/null and b/d14_anim.webm differ
diff --git a/d14_input.txt b/d14_input.txt
new file mode 100644
index 0000000..19afc33
--- /dev/null
+++ b/d14_input.txt
@@ -0,0 +1,163 @@
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+485,125 -> 489,125
diff --git a/d14_output.txt b/d14_output.txt
new file mode 100644
index 0000000..674ad15
--- /dev/null
+++ b/d14_output.txt
@@ -0,0 +1,2 @@
+728
+27623
diff --git a/makeanim.sh b/makeanim.sh
index 61d5afb..d0d280b 100755
--- a/makeanim.sh
+++ b/makeanim.sh
@@ -1,4 +1,4 @@
 #!/bin/sh
 ffmpeg -threads 0 -pattern_type glob -i "img/*.pam" -r 60 \
-    -vf "format=yuv444p,setpts=0.05*PTS,scale=iw*4:ih*4:flags=neighbor" \
+    -vf "format=yuv444p,setpts=0.05*PTS,scale=iw*4:ih*4:flags=neighbor:eval=frame,pad=342*4:172*4:(ow-iw)/2:(oh-ih)/2" \
     anim.webm