
import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
      String[] nyu=sc.nextLine().split("");


  //   String nyu=sc.nextLine();
int A=Integer.parseInt(nyu[0]);
int B=Integer.parseInt(nyu[1]);
int C=Integer.parseInt(nyu[2]);
//int D=Integer.parseInt(nyu[3]);


//double A=Double.parseDouble(nyu[0]);
//double B=Double.parseDouble(nyu[1]);
/*
switch(C){
case 7:
case 5:
case 3:
System.out.println("YES") ;
break;
default:
System.out.println("NO") ;

break;
}
*/

if(A+B<=C){
System.out.println("Yes");
}else{
System.out.println("No");

}





	}
}