#include<bits/stdc++.h>
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";
	}
	else cout<<"No";
	

	return 0;
}

/**************************************************************
	Problem: 1045
	User: 21A
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/