// Σ_{i,j < n} i*j computed by a doubly-nested loop.

int NestedSum(int n) {
  int total = 0;
  int i = 0;
  while (i < n) {
    int j = 0;
    while (j < n) {
      total = total + i * j;
      j = j + 1;
    };
    i = i + 1;
  };
  return total;
}