#include<iostream>

using namespace std;

bool isTrangle(double a, double b, double c)
{
    if (b + c > a && a + b > c && a + c > b)
    {
        return true;
    }
    else
    {
        return false;
    }
}

int main()
{
    double a, b, c;
    while (cin >> a >> b >> c)
    {
        if (isTrangle(a, b, c) == true)
        {
            cout << "Yes" << endl;
        }
        else
        {
            cout << "No" << endl;
        }
    }
    return 0;
}