diff --git a/31 b/31
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index 0000000..2ee4f5d
Binary files /dev/null and b/31 differ
diff --git a/31.c b/31.c
new file mode 100644
index 0000000..3bdd4d1
--- /dev/null
+++ b/31.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main (int argc, char* argv[]) {
+    int* ways = calloc (201, sizeof (int));
+    ways[0] = 1;
+    int coins[8] = { 1, 2, 5, 10, 20, 50, 100, 200 };
+    for (int c = 0; c < 8; c++) {
+        for (int w = 0; w <= 200; w++) {
+            if (w >= coins[c]) {
+                ways[w] += ways[w - coins[c]];
+            }
+        }
+    }
+    printf ("%d\n", ways[200]);
+}
diff --git a/31_brute b/31_brute
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index 0000000..6da54ee
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diff --git a/31_brute.c b/31_brute.c
new file mode 100644
index 0000000..10b2a76
--- /dev/null
+++ b/31_brute.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main (int argc, char* argv[]) {
+    int ways = 0;
+    for (int L2 = 0; L2 <= 1; L2++) {
+        for (int L1 = 0; L1 <= 2; L1++) {
+            for (int p50 = 0; p50 <= 4; p50++) {
+                for (int p20 = 0; p20 <= 10; p20++) {
+                    for (int p10 = 0; p10 <= 20; p10++) {
+                        for (int p5 = 0; p5 <= 40; p5++) {
+                            for (int p2 = 0; p2 <= 100; p2++) {
+                                for (int p1 = 0; p1 <= 200; p1++) {
+                                    if (p1 + 2*p2 + 5*p5 + 10*p10 + 20*p20 + 50*p50 + 100*L1 + 200*L2) 
+                                        ways++;
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    printf ("%d\n", ways);
+}