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

int main() {
  string N, ans = "No";
  cin >> N;
  for(char s : N) {
    if (s == '7') ans = "Yes";
  }
  cout << ans << endl;
}

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

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


