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

typedef long long ll;
int main()
{
    string N;
    cin >> N;
    for (int i = 0; i < 3; ++i)
    {
        if (N[i] == '7')
            cout << "Yes" << endl;
        return 0;
    }
    cout << "No" << endl;
}
