#include<iostream>
using namespace std;
int main(){
    int a,b,c;
    cin>>a>>b>>c;
    if(a + b > c && b + c > a && a + c > b)    {
        cout<<"Yes"<<endl;
    }else{
        cout<<"No"<<endl;
    }
}
   
/**************************************************************
	Problem: 1045
	User: admin
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/