#include<bits/stdc++.h>
using namespace std;
int main()
{
    string s;
    cin>>s;

    if(s.at(0)=='7' || s.at(1)=='7' || s.at(2)=='7')
    {
        cout<<"Yes"<<endl;
    }

    else
    {
        cout<<"No"<<endl;
    }

    return 0;
}
