#include <bits/stdc++.h>
using namespace std;

int main()
{
    string n;
    cin >> n;
    for (int i = 0; i < n.length(); i++)
    {
        if (n.at(i) == '7')
        {
            cout << "Yes" << endl;
            return 0;
        }
    }
    cout << "No" << endl;
}