Functions in C.c

#include <stdio.h>
int max_of_two(int a, int b){
    if(a>b){
        return a;
    }else {
        return b; 
    }
}
int max_of_four(int a, int b, int c, int d){
    return max_of_two(max_of_two(a, b), max_of_two(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;
}