function get_num(N) result(t)
  integer::N,t
  if(MOD(N,400).eq.0) then
     t = 2
  else if(MOD(N,100).eq.0) then
     t = 1
  else if(MOD(N,4).eq.0) then
     t = 2
  else
     t = 1
  end if
end function get_num

program main
  implicit none
  interface
     function get_num(N) result(t)
       integer::N,t
     end function get_num
  end interface
  integer::N,M,i,youbi,onaji
  read *,N
  M = (N-2014)/400

  onaji = 0
  youbi = 0
  do i=2015,(N-M*400)
     youbi = MOD(youbi+get_num(i),7)
     if(youbi.eq.0) then
        onaji = onaji + 1
     end if
!     print '(i0," ",i0)', i, youbi
  end do

  print '(i0)', onaji + M*57
end program main