HackerRank C- Functions in C

You have to write a function int max_of_four(int a, int b, int c, int d) which reads four arguments and returns the greatest of them

#include <stdio.h>
int max_of_four(int a, int b, int c, int d)
{
    int max=0;
    if(max<a)
    max=a;
    if(max<b)
    max=b;
    if(max<c)
    max=c;
    if(max<d)
    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;
}