package com.javarush.task.task04.task0419;

import java.io.BufferedReader;
import java.io.InputStreamReader;

/*
Максимум четырех чисел
*/

public class Solution {
    public static void main(String[] args) throws Exception {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        Integer a = Integer.parseInt(reader.readLine());
        Integer b = Integer.parseInt(reader.readLine());
        Integer c = Integer.parseInt(reader.readLine());
        Integer d = Integer.parseInt(reader.readLine());

        if (a > b && a > c && a > d)
        {
            System.out.println(a);
        } else if (b > a && b > c && b > d)
        {
            System.out.println(b);
        } else if (c > a && c > b && c > d)
        {
            System.out.println(c);
        } else if (a == b && b == c && c == d)
        {
            System.out.println(c);
        }

    }
}