#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	cout<<(a+b>c?"yes":"no");
	return 0;
}

#include<iostream>
using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a+b>c){
	cout<<"yes";	
	} 
	else{
		cout<<"no";	
	}
	return 0;
} 

#include<iostream>
using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a+b>c) cout<<"yes";
	else cout<<"no";
	return 0;
}