//#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (n); i++)
#define all(v) v.begin(), v.end()
#define allr(v) v.rbegin(), v.rend()


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