function_ hackerrank.cpp

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


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