#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: wangyousi
	Language: C++
	Result: Accepted
	Time:19 ms
	Memory:2072 kb
****************************************************************/