#!/usr/bin/env python3

n = int(input())
v = []
for _ in range(n):
    k = int(input())
    p = []
    mx = 100000
    my = 100000
    for _ in range(k):
        x, y = map(int, input().split())
        mx = min(mx, x)
        my = min(my, y)
        p.append([x, y])
    for i in range(k):
        p[i][0] -= mx
        p[i][1] -= my
    p.sort()
    v.append(p)
v.sort()
a = n
for i in range(1, n):
    if v[i] == v[i - 1]:
        a -= 1
print(a)