#include <bits/stdc++.h>
using namespace std;
int main()
{
    int t, n, i, a, b;
    string s;

    cin >> s;
    if (s[0] == '7' || s[1] == '7' || s[2] == '7')
        cout << "Yes" << "\n";
    else
        cout << "No" << "\n";


    return 0;
}
  