import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner stdin = new Scanner(System.in);
		int a, b, c;
		a= stdin.nextInt();
		b= stdin.nextInt();
		c= stdin.nextInt();
		if(a+b>c) {
			System.out.println("yes");
		}else {
			System.out.println("no");
		}

	}

}
