#include <stdio.h>

int max(int x, int y);

int main(void) {
    int a,b,c,d;

    a = 7;
    b = 2;
    c = 5;
    d = 8;

    printf("%d\n", max(max(a, b), max(c, d)));

    return 0;
}

int max(int x, int y){
	
	if(x>y){
		return x;
	}
	else{
		return y;
	}
}