#include <bits/stdc++.h>
#define ll long long
using namespace std;


int main()
{
    string n ;
    cin >> n  ;
    if(n[0] == '7' || n[1] == '7' || n[2] == '7')
        cout<< "Yes\n";
    else
        cout << "No";
    return 0;
}
