text: #include <stdio.h>
  /*
  Add `int max_of_four(int a, int b, int c, int d)` here.
  */
  int max_of_four(int ,int ,int ,int );
  
  int main() {
      int a, b, c, d;
      scanf("%d %d %d %d", &a, &b, &c, &d);
      int ans = max_of_four(a, b, c, d);
      printf("%d", ans);
      
      return 0;
  }
  int max_of_four(int a,int b,int c,int d)
  {
      int max;
      max=(a>b)?((a>c)?((a>d)?a:d):((c>d)?c:d)):((b>c)?((b>d)?b:d):((c>d)?c:d)); //Finding maximum value
      return max; 
  }
  