#include <bits/stdc++.h>
#define rep(i,n) for (int i=0; i<n; i++)
using namespace std;
using ll = long long;

int main() {
  string str;
  cin >> str;
  bool flg = false;
  for(int i=0; i< str.size(); i++) {
    if (str[i] == '7') {
      flg = true;
    }
  }
  if (flg) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }











}
