Problem: You are given n triangles. 

You are required to find how many triangles are unique out of given triangles.
For each triangle you are given three integers a,b,c , the sides of a
triangle.

A triangle is said to be unique if there is no other triangle with same set of sides.

Note : It is always possible to form triangle with given sides.

INPUT:

First line contains n, the number of triangles. Each of next n lines contain
three integers a,b,c (sides of a triangle).

Output:

print single integer, the number of unique triangles.

Constraints:

1 ≤ n ≤ 10^5
1 ≤ a,b,c ≤ 10^15

SAMPLE INPUT
5
7 6 5
5 7 6
8 2 9
2 3 4
2 4 3 

SAMPLE OUTPUT
1

Explanation

only triangle with sides 8, 2, 9 is unique

Solution (in PYTHON):

Solution:
lines = int(raw_input())
s_dict = {}
c = 0

for i in range(lines):
	l = sorted(raw_input().split())
	s = '.'.join(l)
	if s in s_dict:
		s_dict[s] = False
	else:
		s_dict[s] = True

for s, flag in s_dict.items():
	if flag:
		c += 1

print c