#include <iostream> #include <cstdio> using namespace std; int max_of_four(int a, int b, int c, int d) { int max = a; if(b > max) max = b; if(c > max) max = c; if(d > max) max = d; return max; } 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; }