#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b,c,n;
    cin>>a>>b>>c;
    n=a+b;
    if(n>c)
        cout<<"yes";
    else
        cout<<"no";
}
/**************************************************************
	Problem: 1036
	User: baizhoudeyueguang
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/