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