program prob1
    implicit none
    integer::a,b,c,d,e,k
    read(*,*) a
    read(*,*) b
    read(*,*) c
    read(*,*) d
    read(*,*) e
    read(*,*) k

    if(e-a > k)then
        write(*,'(a)') ":("
    else
        write(*,'(a)') "Yay!"
    end if
    stop
end program