
#include <iostream>
#include <algorithm>
#include <deque>
#include <iterator>
#include <list>
#include <map>
#include <memory>
#include <queue>
#include <set>
#include <stack>
#include <utility>
#include <vector>
#include <string>
#include <iostream>
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;
}
  