#include <bits/stdc++.h>

using namespace std;

int main()
{
    string N;
    cin >> N;
    for (int i = 0; i < N.size(); i++)
    {
        if (N[i] == '7')
        {
            cout << "Yes" << endl;
            return 0;
        }
    }

    cout << "No" << endl;

    return 0;
}