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