#include<bits/stdc++.h>
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;
}
