#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;
            return 0;
        }
    }
    cout << "No" << endl;

    return 0;
}
