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((1 <= A && B <= 500) && (1 <= C && C <= 1000) && (C <= A + B))
				System.out.println("Yes");
			else System.out.println("No");
			}}