import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner scanner = new Scanner(System.in);
		int a = 0;
		a += scanner.nextInt();
		a += scanner.nextInt();
		String s = scanner.nextInt() <= a ? "yes" : "no" ;
		
		System.out.println(s);
	}

}