v = {}
n = 6
c = 0

for i = 1, n do
	z = {}
	for j = 1, 5 do
		table.insert(z, io.read("*n"))
	end
	v[i] = z
end

for i = 1, n do
	ci = 0
	for j = 1, 4 do
		if math.abs(v[i][j] - v[i][j+1]) > 3 then
			ci = 1
		end
	end
	sort1 = v[i]
	table.sort(sort1)
	sort2 = v[i]
	table.sort(sort2, function(a,b) return a > b end)
	x = 0
	y = 0
	for j = 1,5 do
		if v[i][j] ~= sort1[j] then
			x = 1
		end
		if v[i][j] ~= sort2[j] then
			y = 1
		end
	end

	if x == 1 or y == 1 then
		c1 = 1
	end


	if ci == 0 then
		c = c + 1
	end
end

print(c)