#include <iostream>
 
int main()
{
   int z=401;
   do
   {
      if(z%10==4)
      {
         std::cout << "Yes" << std::endl;
         return 0;
      }
      z/=10;
   }
   while(z);
   std::cout << "No" << std::endl;
   return 0;
}

Yes