#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)
using namespace std;
using ll = long long;

int main()
{
    int n, m;
    cin >> n;

    while (n > 0)
    {
        m = n % 10;
        if (m == 7)
        {
            cout << "Yes" << endl;
            return 0;
        }
        n /= 10;
    }

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