#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < n; i++)
#define all(v) v.begin(), v.end()
template <class T, class U>
inline bool chmax(T& a, U b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}
template <class T, class U>
inline bool chmin(T& a, U b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}
constexpr int INF = 1000000000;
constexpr ll llINF = 3000000000000000000;
constexpr int mod = 998244353;
const ll half = (mod + 1) / 2;
constexpr double eps = 1e-10;
vector<int> prime_list(int n) {
    vector<int> v(n + 1), res;
    for (int i = n; i >= 2; i--) {
        for (int j = i; j <= n; j += i) v[j] = i;
    }
    for (int i = 2; i <= n; i++) {
        if (v[i] == i) res.push_back(i);
    }
    return res;
}
vector<int> next_divisor(int n) {
    vector<int> v(n + 1);
    for (int i = n; i >= 2; i--) {
        for (int j = i; j <= n; j += i) v[j] = i;
    }
    return v;
}
ll modpow(ll a, ll b, ll m = mod) {
    ll res = 1;
    while (b) {
        if (b & 1) {
            res *= a;
            res %= m;
        }
        a *= a;
        a %= m;
        b >>= 1;
    }
    return res;
}
vector<ll> inv, fact, factinv;
void init_fact(int n) {
    inv.resize(n + 1);
    fact.resize(n + 1);
    factinv.resize(n + 1);
    inv[0] = 0;
    inv[1] = 1;
    fact[0] = 1;
    factinv[0] = 1;
    for (ll i = 1; i <= n; i++) {
        if (i >= 2) inv[i] = mod - ((mod / i) * inv[mod % i] % mod);
        fact[i] = (fact[i - 1] * i) % mod;
        factinv[i] = factinv[i - 1] * inv[i] % mod;
    }
}
ll modinv(ll a, ll m = mod) {
    // gcd(a,m) must be 1
    ll b = m, u = 1, v = 0;
    while (b) {
        ll t = a / b;
        a -= t * b;
        swap(a, b);
        u -= t * v;
        swap(u, v);
    }
    u %= m;
    if (u < 0) u += m;
    return u;
}
ll comb(int a, int b) {
    if (a < b || a < 0 || b < 0) return 0;
    return fact[a] * factinv[a - b] % mod * factinv[b] % mod;
}
template <class S, S (*op)(S, S), S (*e)()>
struct segtree {
    int siz = 1;
    vector<S> dat;
    segtree(int n) : segtree(vector<S>(n, e())) {}
    segtree(const vector<S>& a) {
        while (siz < a.size()) siz <<= 1;
        dat = vector<S>(siz << 1, e());
        for (int i = 0; i < a.size(); i++) dat[siz + i] = a[i];
        for (int i = siz - 1; i >= 1; i--) dat[i] = op(dat[2 * i], dat[2 * i + 1]);
    }
    void set(int p, S x) {
        p += siz;
        dat[p] = x;
        while (p > 0) {
            p >>= 1;
            dat[p] = op(dat[2 * p], dat[2 * p + 1]);
        }
    }
    void add(int p, S x) { set(p, get(p) + x); }
    S get(int p) { return dat[p + siz]; }
    S prod(int l, int r) {
        S vl = e(), vr = e();
        l += siz, r += siz;
        while (l < r) {
            if (l & 1) vl = op(vl, dat[l++]);
            if (r & 1) vr = op(dat[--r], vr);
            l >>= 1, r >>= 1;
        }
        return op(vl, vr);
    }
    S all_prod() { return dat[1]; }
};
int op(int a, int b) { return (a + b) % mod; }
int e() { return 0; }
void solve() {
    int n;
    cin >> n;
    vector<int> x(n), y(n);
    rep(i, n) {
        cin >> x[i] >> y[i];
        int a = x[i] + y[i], b = x[i] - y[i];
        x[i] = a, y[i] = b;
    }
    if (x[0] > x[n - 1]) {
        swap(x[0], x[n - 1]);
        swap(y[0], y[n - 1]);
    }
    if (y[0] > y[n - 1]) {
        rep(i, n) y[i] = -y[i];
    }
    vector<pair<int, int>> v;
    rep(i, n) {
        if (x[0] <= x[i] && x[i] <= x[n - 1] && y[0] <= y[i] && y[i] <= y[n - 1]) v.push_back({x[i], y[i]});
    }
    sort(all(v));
    vector<int> a;
    rep(i, v.size()) a.push_back(v[i].second);
    vector<int> tmp = a;
    sort(all(tmp));
    tmp.erase(unique(all(tmp)), tmp.end());
    rep(i, a.size()) a[i] = lower_bound(all(tmp), a[i]) - tmp.begin();
    segtree<int, op, e> seg(tmp.size());
    seg.set(a[0], 1);
    for (int i = 1; i < a.size() - 1; i++) {
        seg.set(a[i], op(seg.get(a[i]), seg.prod(0, a[i] + 1)));
    }
    cout << seg.all_prod() << endl;
}
int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    /*int t;
    cin >> t;
    while (t--)*/
    solve();
}