#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: chenmingyu
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/