import math
N = int(input())
A = [0] * N
B = [0] * N
for i in range(N):
	A[i], B[i] = map(int,input().split())
c, d = 0, 1
for i in range(N):
	e, f = c * B[i] + d * A[i], d * B[i]
	g = math.gcd(e, f)
	e //= g
	f //= g
	c, d = e, f
print(c % 998244353, d % 998244353)