#include <stdio.h>
//関数のプロトタイプ宣言
//ここ↓を埋めてね１
int max(int x, int y);
//main関数
int main(void) {
    int a,b,c,d;
//ここ↓を埋めてね２
a = 1;
b = 5;
c = 3;
d = 4;
int result = max(max(a, b), max(c, d));
printf("4つの数 %d, %d, %d, %d の最大値は: %d\n", a, b, c, d, result);
	return 0;
}
 
//max関数の定義
int max(int x, int y){
//ここ↓を埋めてね３
if (x > y) {
        return x;
    } else {
        return y;
    }
}
 
 
 

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