from functools import cmp_to_key
from math import gcd
import sys
input = sys.stdin.readline
mod = 10 ** 9 + 7


def floor_sum(n, m, a, b):
	if(m == 0):
		return 0
	res = 0
	while(True):
		if(a >= m or a < 0):
			res += n * (n - 1) * (a // m) // 2
			a %= m
		if(b >= m or b < 0):
			res += n * (b // m)
			b %= m
		y_max = a * n + b
		if(y_max < m):
			break
		n, b, m, a = y_max // m, y_max % m, a, m
	return res   

def arg_sort(v1, v2):
	x1, y1 = v1
	x2, y2 = v2
	if(x1 * y2 == x2 * y1):
		return 0
	elif(x1 * y2 - x2 * y1 < 0):
		return 1
	else:
		return -1

n = int(input())
v = []
for _ in [0] * n:
	x, y = map(int, input().split())
	if(x == 0 and y == 0):
		n -= 1
		continue
	if(y < 0):
		x = -x;		y = -y
	v.append((x, y))
v.sort(key = cmp_to_key(arg_sort))

ans = 1
for x, y in v:
	ans += gcd(abs(x), y)
	ans %= mod

last = 0
for x, y in v[::-1]:
	a = 1
	s = 0
	if(x < 0):
		a = -1
		x = -x
	s += floor_sum(x, x, y, 0) % mod + x * last % mod
	s %= mod
	ans += mod + a * s
	ans %= mod
	last += mod + y
	last %= mod

last = 0
for x, y in v:
	a = -1
	s = 0
	if(x < 0):
		a = 1
		x = -x
	s += floor_sum(x, x, y, 0) % mod + x * last % mod
	s %= mod
	ans += mod + a * s
	ans %= mod
	last += mod + y
	last %= mod

print(ans)