#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: sucongyi
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/