#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<<"Yes"; 
	} else{
		cout<<"No";
	}
	
} 
/**************************************************************
	Problem: 1045
	User: linzihang
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/