#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,top;
//ここ↓を埋めてね２
    scanf("%d%d%d%d",&a,&b,&c,&d);
    top=max(max(a,b),max(c,d));
    printf("最大の値は%d",top);
	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 if(x<y){
    	return y;
    }
}
 
 
 

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