program sample
    implicit none
  
    integer(8) :: i,j,m,n,a,b,c,d,e,k
    
    integer(8),allocatable :: x(:),y(:)
  
    
    read(*,*) a
    read(*,*) b
    read(*,*) c
    read(*,*) d
    read(*,*) e
    read(*,*) k
    if (e-a>k)then
        write(*,*) ':('
    else
        write(*,*) 'Yay!'
    end if

  
    stop
end program sample
  

