uva 10550 - Combination Lock

Problem link

#include <iostream>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;

int main() {
 int a,b,c,d;
 cin >> a >> b >> c >> d;
 while (a!=0 || b!=0 || c!=0 || d!=0)
 {
  int g1,g2,g3;
  if (b>a) g1 = 40-b+a; else g1 = a-b;
  if (c>b) g2 = c-b; else g2=40-b+c;
  if (d>c) g3 = 40+c-d; else g3 = c-d;
  int result = 360*2 + g1*9 + 360 + g2*9 + g3*9;
  cout << result << endl;
  cin >> a >> b >> c >> d;
 }
 return 0;
}