#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b,c;
    scanf("%d %d %d",&a,&b,&c);
    if(a+b>c){
        cout<<"yes";
    }else{
        cout<<"no";
    }
     
} 
/**************************************************************
	Problem: 1036
	User: zhangyilei
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/