Index: aoc2015.c
==================================================================
--- aoc2015.c
+++ aoc2015.c
@@ -3,11 +3,11 @@
 #include "aocdailies.h"
 #include "aocutils.h"
 
 void aoc201502(char *data, size_t len) {
     (void)len; // unused argument
-    unsigned sqf = 0;
+    unsigned sqf = 0, f = 0;
     for (;;) {
         char *err;
         unsigned l = strtoul(data, &err, 10);
         if (*err == 0) break;
         data = err + 1; // skip 'x'
@@ -18,12 +18,16 @@
         unsigned lw = l * w;
         unsigned wh = w * h;
         unsigned hl = h * l;
         unsigned m = min3u(lw, wh, hl);
         sqf += 2*(lw + wh + hl) + m;
+        unsigned M = max3u(l, w, h);
+        unsigned feet = 2*(l+w+h - M) + l*h*w;
+        f += feet;
     }
     printf("The elves need %u square feet of paper.\n", sqf);
+    printf("The elves need %u feet of ribbon.\n", f);
 }
 
 void aoc201501(char *data, size_t len) {
     (void)len; // unused argument
     int floor = 0, basementsteps = -1;