#include <stdio.h> /* Add `int max_of_four(int a, int b, int c, int d)` here. */ int max(int a, int b) { // this is a ternary operator // conditional ? return value if true : return value if false return a > b ? a : b; } int max_of_four(int a, int b, int c, int d) { return max(a, max(b, max(c, d))); } 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; }