#include <bits/stdc++.h>
using namespace std;

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