import java.util.Scanner;
public class Main {
    
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int max = Integer.MIN_VALUE;
        int num;
        while(sc.hasNextInt()) {
            num = sc.nextInt();
            if(num > max) {
                max = num;
            }
        }
        System.out.println(max);
    }
}