int max_value(list<int> a) {
  int max_val;
  int i;
  max_val = -1; // assume all elements are positive
  for (i = 0; i < #a; ++i) {
    if (a[i] > max_val) {
      max_val = a[i];
    }
  }
}

int main() {
  list<int> a;
  a = [4, 10, 40, 23, 85, 2];
  printi(max_value(a));
  return 0;
}

output: 85