#include <iostream>

using namespace std;

int
main()
{
    string n;
    cin >> n;

    for(int i=0;i<n.length();i++){
        if(n.at(i) == '7'){
            cout << "Yes" << endl;
            return 0;
        }
    }
    cout << "No" << endl;

    return 0;
}
