#include <bits/stdc++.h>

using namespace std;



int main()
{
    int n;
    cin >> n;
    if(n % 10 == 7 || n / 10 % 10 == 7 || n / 100 % 10 == 7)
        cout << "Yes\n";
    else cout << "No\n";
    return 0;
}
