#include <stdio.h>
 
// 関数のプロトタイプ宣言
int max(int x, int y);
 
// main関数
int main(void) {
    int a,b,c,d;
 
    // 4つの整数をいれる
    scanf("%d %d %d %d", &a, &b, &c, &d);
 
    // 入れ子の max で4つの最大値を求める（main内で大小比較はしない）
    int aaa = max( max(a, b), max(c, d) );
 
    printf("%d\n", aaa);
    return 0;
}
 
// max関数の定義（2つのうち大きい方を返す）
int max(int x, int y){
    return (x > y) ? x : y;
}
 
 

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