#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin >> n;
    int a, b, c;
    a = n % 10;
    n = n / 10;
    b = n % 10;
    n = n / 10;
    c = n % 10;
    if (a == 7 || b == 7 || c == 7)
    {
        cout << "Yes" << endl;
    }
    else
    {
        cout << "No" << endl;
    }
}