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

int main()
{
    string s;
    cin >> s;

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

    cout << "No" << endl;
}
