import bisect
import copy
import itertools

mod = 998244353

class BinaryIndexedTree:
    def __init__(self, n):
        self.n = n
        self.data = [0] * (n + 1)
    def add(self, k, x):
        k += 1
        while k <= self.n:
            self.data[k] += x
            self.data[k] %= mod
            k += k & -k
    def sum(self, k):
        res = 0
        while k:
            res += self.data[k]
            res %= mod
        return res

def compress(A):
    B = [l[0] for l in itertools.groupby(sorted(A))]
    A = [bisect.bisect_left(B, i) for i in A]
    return len(B)

N = int(input())
X = []
Y = []
for i in range(N):
    a, b = map(int, input().split())
    X += [a + b]
    Y += [a - b]
if X[0] > X[-1]:
    for i in range(N):
        X[i] = -X[i]
if Y[0] > Y[-1]:
    for i in range(N):
        Y[i] = -Y[i]

compress(X)
K = compress(Y)
A = []
for i in range(N):
    if X[0] > X[i] or X[i] > X[-1]:
        continue
    if Y[0] > Y[i] or Y[i] > Y[-1]:
        continue
    A += [(X[i], Y[i])]
M = len(A)
A.sort()
BIT = BinaryIndexedTree(K)
for i in range(M):
    if i == 0:
        BIT.add(0, 1)
    elif i == M - 1:
        print(BIT.sum(K))
    else:
        BIT.add(A[i][1], BIT.sum(A[i][1] + 1))