program main
	implicit none
	integer ::n,pow=0,a(1:3),num(1:10)=0
	integer i,j
	read(*,*)n
	do i=1,n
		read(*,*)a(1:3)
		do j=1,3
			num(a(j))=num(a(j))+1
		enddo
	enddo
	do i=1,10
		do while(num(i)>=2)
			pow=pow+1
			num(i)=num(i)-2
		enddo
	enddo
	if(sum(num)>=8)then
		pow=pow+2
	elseif(sum(num)>=4)then
		pow=pow+1
	endif
	write(*,*)pow
end program