diff --git a/day16p1/Makefile b/day16p1/Makefile
new file mode 100644
index 0000000..c711967
--- /dev/null
+++ b/day16p1/Makefile
@@ -0,0 +1,12 @@
+CFLAGS := -Wall -Wextra -std=c17 -D_GNU_SOURCE
+
+LIBS := glib-2.0
+CFLAGS += $(shell pkg-config --cflags $(LIBS))
+LDLIBS := $(shell pkg-config --libs $(LIBS))
+
+.PHONY: all
+all: main
+
+.PHONY: clean
+clean:
+	rm -f main
diff --git a/day16p1/input b/day16p1/input
new file mode 100644
index 0000000..88aab0a
--- /dev/null
+++ b/day16p1/input
@@ -0,0 +1,4148 @@
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diff --git a/day16p1/main.c b/day16p1/main.c
new file mode 100644
index 0000000..bb2aa99
--- /dev/null
+++ b/day16p1/main.c
@@ -0,0 +1,175 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <glib.h>
+
+#define REGS 4
+
+enum instr_id {
+    INSTR_ADDR,
+    INSTR_ADDI,
+    INSTR_MULR,
+    INSTR_MULI,
+    INSTR_BANR,
+    INSTR_BANI,
+    INSTR_BORR,
+    INSTR_BORI,
+    INSTR_SETR,
+    INSTR_SETI,
+    INSTR_GTIR,
+    INSTR_GTRI,
+    INSTR_GTRR,
+    INSTR_EQIR,
+    INSTR_EQRI,
+    INSTR_EQRR,
+    INSTR_ID_COUNT
+};
+
+struct instr {
+    enum instr_id i;
+    int a;
+    int b;
+    int c;
+};
+
+struct sample {
+    int before[REGS];
+    int after[REGS];
+    struct instr instr;
+};
+
+const char *instr_str[] = {
+    "addr",
+    "addi",
+    "mulr",
+    "muli",
+    "banr",
+    "bani",
+    "borr",
+    "bori",
+    "setr",
+    "seti",
+    "gtir",
+    "gtri",
+    "gtrr",
+    "eqir",
+    "eqri",
+    "eqrr"
+};
+
+void instr_interpret(int *r, struct instr *i)
+{
+    switch (i->i) {
+    case INSTR_ADDR:
+    case INSTR_MULR:
+    case INSTR_BANR:
+    case INSTR_BORR:
+    case INSTR_GTRR:
+    case INSTR_EQRR:
+        if (i->b >= REGS) return;
+        // fallthrough
+    case INSTR_ADDI:
+    case INSTR_MULI:
+    case INSTR_BANI:
+    case INSTR_BORI:
+    case INSTR_SETR:
+    case INSTR_GTRI:
+    case INSTR_EQRI:
+        if (i->a >= REGS) return;
+        // fallthrough
+    case INSTR_SETI:
+        if (i->c >= REGS) return;
+        break;
+
+    case INSTR_GTIR:
+    case INSTR_EQIR:
+        if (i->b >= REGS) return;
+        if (i->c >= REGS) return;
+        break;
+
+    default:
+        break;
+    }
+
+    switch (i->i) {
+    case INSTR_ADDR: r[i->c] = r[i->a] + r[i->b]; break;
+    case INSTR_ADDI: r[i->c] = r[i->a] + i->b; break;
+    case INSTR_MULR: r[i->c] = r[i->a] * r[i->b]; break;
+    case INSTR_MULI: r[i->c] = r[i->a] * i->b; break;
+    case INSTR_BANR: r[i->c] = r[i->a] & r[i->b]; break;
+    case INSTR_BANI: r[i->c] = r[i->a] & i->b; break;
+    case INSTR_BORR: r[i->c] = r[i->a] | r[i->b]; break;
+    case INSTR_BORI: r[i->c] = r[i->a] | i->b; break;
+    case INSTR_SETR: r[i->c] = r[i->a]; break;
+    case INSTR_SETI: r[i->c] = i->a; break;
+    case INSTR_GTIR: r[i->c] = (i->a > r[i->b]) ? 1 : 0; break;
+    case INSTR_GTRI: r[i->c] = (r[i->a] > i->b) ? 1 : 0; break;
+    case INSTR_GTRR: r[i->c] = (r[i->a] > r[i->b]) ? 1 : 0; break;
+    case INSTR_EQIR: r[i->c] = (i->a == r[i->b]) ? 1 : 0; break;
+    case INSTR_EQRI: r[i->c] = (r[i->a] == i->b) ? 1 : 0; break;
+    case INSTR_EQRR: r[i->c] = (r[i->a] == r[i->b]) ? 1 : 0; break;
+    default: break;
+    }
+}
+
+struct sample *parse_samples(const char *fname, int *len)
+{
+    FILE *f = fopen(fname, "r");
+    if (!f) {
+        perror(fname);
+        return NULL;
+    }
+
+    GArray *array = g_array_new(FALSE, FALSE, sizeof(struct sample));
+
+    // Haha what is proper parsing
+    struct sample sample;
+    while (fscanf(f,
+            "Before: [%d, %d, %d, %d]\n"
+            "%d %d %d %d\n"
+            "After:  [%d, %d, %d, %d]\n\n",
+            &sample.before[0], &sample.before[1],
+            &sample.before[2], &sample.before[3],
+            (int *)&sample.instr.i, &sample.instr.a,
+            &sample.instr.b, &sample.instr.c,
+            &sample.after[0], &sample.after[1],
+            &sample.after[2], &sample.after[3]
+            ) == 12) {
+        g_array_append_val(array, sample);
+    }
+
+    fclose(f);
+
+    *len = array->len;
+    return (struct sample *)g_array_free(array, FALSE);
+}
+
+int main()
+{
+    int samples_len = 0;
+    struct sample *samples = parse_samples("input", &samples_len);
+    if (!samples) return 1;
+
+    int *regs = g_new0(int, REGS);
+    int result = 0;
+    for (struct sample *sample = samples;
+            sample < samples + samples_len; sample++) {
+        int pass = 0;
+        struct instr instr;
+        memcpy(&instr, &sample->instr, sizeof(struct instr));
+        for (enum instr_id i = 0; i < INSTR_ID_COUNT; i++) {
+            instr.i = i;
+            memcpy(regs, sample->before, sizeof(int) * REGS);
+            instr_interpret(regs, &instr);
+            if (memcmp(regs, sample->after, sizeof(int) * REGS) == 0) pass++;
+        }
+
+        if (pass >= 3) result++;
+    }
+
+    printf("%d/%d\n", result, samples_len);
+
+    g_free(regs);
+    g_free(samples);
+    return 0;
+}