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

int main()
{
    string n;
    cin >> n;
    if (n[0] == '7' || n[1] == '7' || n[2] == '7')
    {
        cout << "Yes" << endl;
        return 0;
    }
    else
    {
        cout << "No" << endl;
        return 0;
    }
}