#include<bits/stdc++.h>
using namespace std;
int main()
{
    string s;
    cin>>s;
    if(s[0]=='7' || s[1]=='7' || s[2]=='7')
    {
        cout<<"Yes"<<endl;
    }
    else
    {
        cout<<"No"<<endl;
    }

    return 0;
}
