#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つの数を入力してください");
scanf("%d %d %d %d ",&a,&b,&c,&d);
printf("最大値=%d\n",max(max(a,b),max(c,d)));
	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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