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package com.javarush.task.task05.task0532;
import java.io.*;
/*
Задача по алгоритмам
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int maximum = 0;
while (true) {
int a = Integer.parseInt(reader.readLine());
if (a >= 0) {
if (maximum < a) {
maximum = a;
}
} else {
break;
}
}
System.out.println(maximum);
}
}