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



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

    return 0;
}