#!/usr/bin/env python3

S = set()

n = int(input())

for i in range(n):
    m = int(input())
    cc = [list(map(int, input().split())) for i in range(m)]
    cc.sort()
    xx,yy = cc[0]
    cc = [(c[0]-xx, c[1]-yy) for c in cc]
    S.add(tuple(cc))

print(len(S))