#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
	printf("4つの数を入れてください：");
	scanf("%d %d %d %d",&a,&b,&c,&d);
 
	int maximum=max(max(a,b),max(c,d));
 
	printf("最大値は%dです\n",maximum);
	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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