import java.util.*;
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 + 2 * b >= c) {
         System.out.println("Yes");
      }
      else {
         System.out.println("No");
      }
   }
}