#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
scanf("%d%d%d%d", &a
, &b
, &c
, &d
); printf("%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
return (x > y)? x:y;
}
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