#include <bits/stdc++.h>
using namespace std;
int main(){
	int a,b,m;
	cin>>a>>b>>m;
	if(a+b>=m){
		cout<<"No";
	}
	if(a+b<m){
		cout<<"Yes";
	}
}
/**************************************************************
	Problem: 1045
	User: tonghuawei
	Language: C++
	Result: Wrong Answer
****************************************************************/