#include <metal_stdlib>

using namespace metal;
int f() {
  int i = 0;
  int j = 0;
  while (true) {
    i = (i + 1);
    if ((i > 4)) {
      return 1;
    }
    while (true) {
      j = (j + 1);
      if ((j > 4)) {
        return 2;
      }
    }
  }
  return 0;
}

