implicit none
integer(8) i,N,j,c
integer(8),allocatable :: A(:)
integer(8),allocatable :: B(:)
read(*,*) N
allocate (A(1:N))
allocate (B(1:N))
A=0
B=0
c=0
read(*,*) (A(i),i=1,N)
do i=1,N-1
    if (A(i)==A(i+1)) then
        B(i)=B(i)-1
        B(i+1)=B(i+1)-1
    end if
end do
do i=1,N
    if (B(i)==0) then
        c=c+1
    end if
end do
write(*,*) c
end