#include<bits/stdc++.h>
using namespace std;
int a,b,c;
int main(){
    cin>>a>>b>>c;
    if(a+b>c) cout<<"yes";
    else cout<<"no";
    return 0;       
}
/**************************************************************
	Problem: 1035
	User: wuweimo
	Language: C++
	Result: Wrong Answer
****************************************************************/