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