Functions in C (Easy)

#include <stdio.h>
/*
Add `int max_of_four(int a, int b, int c, int d)` here.
*/

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

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;
}