#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つの整数を入力してください\n");
    scanf("%d %d %d %d",&a,&b,&c,&d);
    int maxvalue = max(max(a,b), max(c,d));
    printf("最大の値は%d\n",maxvalue);
	return 0;
}
 
//max関数の定義
int max(int x, int y){
//ここ↓を埋めてね３
return (x > y)? x : y;
 
}
 

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