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

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