int matrix_a[30][30];
int matrix_b[30][30];
int matrix_c[30][30];

void matrix_init(int n, int nonce, int *x, int (*matrix)[30]) {
  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < n; ++j) {
      matrix[i][j] = ++*x;

      if (*x % (nonce + 1)) {
        ++*x;
      }
    }
  }
}

int matrix_mul(int n, int nonce) {
  if (!(n <= 30)) {
    return nonce;
  }

  int x = 0;
  matrix_init(n, nonce, &x, matrix_a);
  matrix_init(n, nonce, &x, matrix_b);

  int result = 0;
  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < n; ++j) {
      matrix_c[i][j] = 0;
      for (int k = 0; k < n; ++k) {
        matrix_c[i][j] += matrix_a[i][k] * matrix_b[k][j];
      }
      result += matrix_c[i][j];
    }
  }

  return result;
}

int matrix_add(int n, int nonce) {
  if (!(n <= 30)) {
    return nonce;
  }

  int x = 0;
  matrix_init(n, nonce, &x, matrix_a);
  matrix_init(n, nonce, &x, matrix_b);

  int result = 0;
  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < n; ++j) {
      matrix_c[i][j] = matrix_a[i][j] + nonce * matrix_b[i][j];
      result += matrix_c[i][j];
    }
  }

  return result;
}