#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";
    }
 
 
}
/**************************************************************
	Problem: 1036
	User: wengzihang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/