import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scan = new Scanner(System.in);
		int a = scan.nextInt();
		int b = scan.nextInt();
		int c = scan.nextInt();
		if(a + b * 2 > c) {
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
}