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

int main()
{

        string s;
        cin >> s;
        for (int i = 0; i < 3; ++i) {
                if (s[i] == '7') {
                        cout << "Yes" << endl;
                        exit(0);
                }
        }
        cout << "No" << endl;


}
