import java.util.Scanner;
public class Main
{   
	public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int d = sc.nextInt();
        int e = sc.nextInt();
        int max = a;
        if(max<b) {
        	max=b;
        }
        if(max<c) {
        	max=c;
        }
        if(max<d) {
        	max=d;
        }
        if(max<e) {
        	max=e;
        }
        System.out.println(max);
    }
}

/**************************************************************
	Problem: 1736
	User: admin
	Language: Java
	Result: Accepted
	Time:714 ms
	Memory:40056 kb
****************************************************************/