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diff --git a/87.c b/87.c
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+// largest prime i where i^2 + 2^3 + 2^4 = 50000000 is 7069
+// largest prime j where 2^2 + j^3 + 2^4 = 50000000 is 367
+// largest prime k where 2^2 + 2^3 + k^4 = 50000000 is 83
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <math.h>
+#include "primes.h"
+
+#define SIZE 50000000
+
+int main(void) {
+    long* primes;
+    bool* primesTable;
+    int length = listOfPrimes(sqrt(SIZE - 24), &primes, &primesTable);
+    //bool visited[SIZE] = {false};
+    int count = 0;
+
+    for (int i = 0; i < length && primes[i] <= 7069; i++) {
+        for (int j = 0; j < length && primes[j] <= 367; j++) {
+            for (int k = 0; k < length && primes[k] <= 83; k++) {
+                int n = pow(primes[i], 2) + pow(primes[j], 3) + pow(primes[k], 4);
+                if (n < SIZE) { //&& !visited[n]) {
+                    count++;
+                    //visited[n] = true;
+                }
+            }
+        }
+    }
+
+    printf("%d\n", count);
+
+    free(primes);
+    free(primesTable);
+}
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