#include <stdlib.h>
#include <stdio.h>

int prod(int i, int j, int n, int b[n][n], int c[n][n])
{
   int sum = 0;
   for (int k = 0; k < n; k++) {
      sum += b[i][k] * c[k][j];
   }
   return sum;
}

int main(int argc, char **argv) {

   int n = atoi(argv[1]);

   int a[n][n];
   int b[n][n];
   int c[n][n];

   for (int i = 0; i < n; i++) {
      for (int j = 0; j < n; j++) {
         b[i][j] = i * j;
         c[i][j] = i + j;
      }
   }

   for (int i = 0; i < n; i++) {
      for (int j = 0; j < n; j++) {
         a[i][j] = prod(i, j, n, b, c);
      }
   }
}