#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 , int);
//main関数
int main(void) {
int a,b,c,d;
//ここ↓を埋めてね2
scanf("%d %d %d %d",&a
,&b
,&c
,&d
); printf("%d",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
return (x>y)? x:y;
}
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