#include<bits/stdc++.h>
using namespace std;
int main(){
int a,b,c;
	cin>>a>>b>>c;
	if(a<b)swap(a,b);
	if(a<c)swap(a,c);
	if(b<c)swap(b,c);
	if((b+c)<=a){
		cout<<"No";
	}else {
		cout<<"Yes";
	}	
	return 0;
}

/**************************************************************
	Problem: 1045
	User: tangkaixuan
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/