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

int main()
{
    int N;
    cin >> N;

    string strN = to_string(N);
    for (int i = 0; i < 3; i++) {
        if (strN[i] == '7') {
            cout << "Yes" << endl;
            return 0;
        }
    }

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