public class Main {

	public static void main(String[] args) {
		int a,b,c;
		 a = 10;
		 b = 20;
		 c = 10;
		 if (a+c == b) {
			 System.out.println("Yes");
			 
		 }
		 else {
			 System.out.println("No");
		 }

	}

}
