#include <bits/stdc++.h>
using namespace std;
int main(){
	int i,o,p;
	cin>>i>>o>>p;
	cout<<(i+o>p?"yes":"no");
	return 0;
}

/**************************************************************
	Problem: 1036
	User: zhouhongyi
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/