diff --git a/86 b/86
new file mode 100644
index 0000000..8ade61f
Binary files /dev/null and b/86 differ
diff --git a/86.c b/86.c
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--- /dev/null
+++ b/86.c
@@ -0,0 +1,18 @@
+#include <math.h>
+#include <stdio.h>
+
+int main(void) {
+    int M = 100, count = 2060;
+    while(count < 1000000) {
+        M++;
+        for (int i = 1; i <= M; i++) {
+            for (int j = i; j <= M; j++) {
+                double path = sqrt((i + j) * (i + j) + M * M);
+                if (path == floor(path)) {
+                    count++;
+                }
+            }
+        }
+    }
+    printf("M = %d has %d distinct cuboids\n", M, count);
+}
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