diff --git a/01/solution.c b/01/solution.c
index 9895af4..b341cec 100644
--- a/01/solution.c
+++ b/01/solution.c
@@ -5,9 +5,14 @@
 
 int main(void) {
     uint16_t answer = 0;
-    for (uint16_t *p = input+1; p < (&input)[1]; p++) {
-        if (*p > *(p-1))
+    uint32_t prev = 0;
+    for (uint16_t *p = input+3; p < (&input)[1]; p++) {
+        uint32_t new = *(p-2) + *(p-1) + *p;
+
+        if (new > prev)
             answer++;
+
+        prev = new;
     }
 
     printf("Answer: %d\n", answer);