package com.javarush.task.task04.task0419;

/*
Максимум четырех чисел
*/

import java.io.*;

public class Solution {
    public static void main(String[] args) throws Exception {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        int a=Integer.parseInt(br.readLine());
        int b=Integer.parseInt(br.readLine());
        int c=Integer.parseInt(br.readLine());
        int d=Integer.parseInt(br.readLine());
        if(a>=b&&a>=c&&a>=d){
            System.out.print(a);

        }

        if(b>a&&b>c&&b>d){
            System.out.print(b);
        }

        if(c>a&&c>b&&c>d){
            System.out.print(c);

        }if(d>a&&d>b&&d>c){
            System.out.print(d);
        }
    }
}