#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
    a = 1;
    b = 5;
    c = 3;
    d = 4;
 
    // 入れ子構造で4つの中から最大値を求める
    int ans = max(max(a, b), max(c, d));
 
    printf("最大値は %d です\n", ans);
 
	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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