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