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


public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String read = br.readLine();
        String [] parsed = read.split(" ");
        int max = 0;
        for(int i=0;i<parsed.length;i++) {
            int tmp = Integer.parseInt(parsed[i]);
            if(tmp>max) {
                max = tmp;
            }
        }
        System.out.println(max);
    }
}