#include<iostream>
#include<string>

using namespace std;

int main(){
    string s;
    cin >> s;
    for (int i = 0; i < 3; i++)
    {
        if(s[i]=='7')
        {
            cout << "Yes" << endl;
            return 0;
        }
    }
    cout << "No" << endl;
    return 0;
}