#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a+b>c&&a+c>b&&b+c>a&&a-b<c&&b-a<c&&a-c<b&&c-a<b&&b-c<a&&c-b<a){
		cout<<"Yes";
	}else{
		cout<<"No";
	}
	return 0;
} 
/**************************************************************
	Problem: 1045
	User: linxichen
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/