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package com.javarush.task.task04.task0419;
/*
Максимум четырех чисел
*/
import java.io.*;
import java.util.*;
public class Solution {
public static void main(String[] args) throws Exception {
Scanner scanner = new Scanner(System.in);
int age = scanner.nextInt();
int agff = scanner.nextInt();
int ag = scanner.nextInt();
int agf = scanner.nextInt();
if (age<ag && agff<ag && agf<ag)
{
System.out.println(ag);
}
else if(ag<age && agff<age && agf<age)
{
System.out.println(age);
}
else if(ag<agf && age<agf && agff<agf)
{
System.out.println(agf);
}
else if(age<agff && agf<agff && ag<agff)
{
System.out.println(agff);
}
}
}