#include<iostream>
#include<algorithm>
#include<vector>
 
using namespace std;
 
int main()
{
  string S;
  
  cin >> S;
 
  if(S[0]=='7'||S[1]=='7'||S[2]=='7')
  {
    cout << "Yes" << endl;
  }
  else
  {
    cout << "No" << endl;
  }
  
  
  return 0;
}