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();
        if (a+b >= c) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }
    }

}