text: int FourWhile() {
    int a;
    a = 5;
    int b;
    int c;
    b = 6;
    c = 7;
    int d;
    d = 10;
    while (a < 20) {
      a = a + 3;
      while(b < 10){
        b = b + 1;
        while(c == 7){
          c = c - 1;
          while(d < 20){
            d = d + 3;
          }
          d = d - 1;
        }
        c = c + 1;
      }
      b = b - 2;
    }
    
    return (a + (b + d) + c);
  }
  
  int main() {
    return FourWhile();
  }
  