import sys

input = sys.stdin.readline

N = int(input())

ps = []
for _ in range(N):
    ps.append(tuple(map(int, input().split())))

cnt = 2

for p in ps[2:]:
    if abs( (ps[1][1] - ps[0][1])*(ps[1][0] - p[0]) ) == abs( (ps[1][1] - p[1])*(ps[1][0] - ps[0][0]) ):
        cnt += 1
print(cnt)