include

int max_of_four(int a, int b, int c, int d){ if(a>b && a>c && a>d){ return a; } else if(b>a && b>c && b>d){ return b; } else if(c>a && c>b && c>d){ return c; } else{ return d; }

}

int main(){ int a,b,c,d; scanf("%d",&a); scanf("%d",&b); scanf("%d",&c); scanf("%d",&d); int res = max_of_four(a,b,c,d); printf("%d",res); }