package com.javarush.task.task18.task1802;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Scanner;
/*
Минимальный байт
*/
public class Solution {
public static void main(String[] args) throws Exception {
Scanner scn = new Scanner(System.in);
String filename = scn.nextLine();
int k=0;
int k1=0;
FileInputStream fileInputStream = new FileInputStream("d:/data.txt");
while (fileInputStream.available()>0)
{
k = fileInputStream.read();
if (k1 < k)
{
k1 = k;
}
}
fileInputStream.close();
System.out.println(k);
}
}