#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if((a+b)>c) cout<<"yes";
    else cout<<"no";
    


   return 0;

}

/**************************************************************
	Problem: 1036
	User: zhuangsongyu
	Language: C++
	Result: Accepted
	Time:19 ms
	Memory:2072 kb
****************************************************************/