diff --git a/d10.py b/d10.py
new file mode 100755
index 0000000..acfaeb6
--- /dev/null
+++ b/d10.py
@@ -0,0 +1,27 @@
+#!/usr/bin/env python3
+
+from sys import argv
+
+i = {int(x.strip()) for x in open(argv[1])}
+i.add(0)
+i.add(max(i)+3)
+
+s = sorted(list(i))
+di = [0]*3
+for x in range(len(s)-1):
+    d = s[x+1] - s[x]
+    di[d-1] += 1
+print(di[0]*di[2])
+
+ch = {}
+def f(x):
+    if x not in i:
+        return 0
+    if x in ch:
+        return ch[x]
+    c = f(x+1) + f(x+2) + f(x+3)
+    if not c:
+        c += 1
+    ch[x] = c
+    return c
+print(f(0))
diff --git a/d10_input.txt b/d10_input.txt
new file mode 100644
index 0000000..7be48d6
--- /dev/null
+++ b/d10_input.txt
@@ -0,0 +1,101 @@
+104
+83
+142
+123
+87
+48
+102
+159
+122
+69
+127
+151
+147
+64
+152
+90
+117
+132
+63
+109
+27
+47
+7
+52
+59
+11
+161
+12
+148
+155
+129
+10
+135
+17
+153
+96
+3
+93
+82
+55
+34
+65
+89
+126
+19
+72
+20
+38
+103
+146
+14
+105
+53
+77
+120
+39
+46
+24
+139
+95
+140
+33
+21
+84
+56
+1
+32
+31
+28
+4
+73
+128
+49
+18
+62
+81
+66
+121
+54
+160
+158
+138
+94
+43
+2
+114
+111
+110
+78
+13
+99
+108
+141
+40
+25
+154
+26
+35
+88
+76
+145
diff --git a/d10_output.txt b/d10_output.txt
new file mode 100644
index 0000000..7f6bb24
--- /dev/null
+++ b/d10_output.txt
@@ -0,0 +1,2 @@
+2201
+169255295254528