#include <bits/stdc++.h>

using namespace std;

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