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

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