#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b,c;
    cin>>a>>b>>c;
    if(a+b>c){
    	cout<<"yes ";
	}
	if(a+b<c){
		cout<<"no";
	}
}
/**************************************************************
	Problem: 1036
	User: toughuatao1
	Language: C++
	Result: Wrong Answer
****************************************************************/