#include <bits/stdc++.h>

using namespace std;

const int mod = 998244353;
// const int mod = 1000000007;
struct modint {
    long long a = 0;
    modint(long long x = 0) {while (x < 0) x += mod; a = x % mod;}
    modint(const modint &r) {a = r.a;}
    modint operator -(){return modint(-a);}
    modint operator +(const modint &r) {return modint(*this) += r;}
    modint operator -(const modint &r) {return modint(*this) -= r;}
    modint operator *(const modint &r) {return modint(*this) *= r;}
    modint &operator +=(const modint &r) {
      a += r.a;
      if(a >= mod) a -= mod;
      return *this;
    }
    modint &operator -=(const modint &r) {
        a -= r.a;
        if(a < 0) a += mod;
        return *this;
    }
    modint &operator *=(const modint &r) {
        a = a * r.a % mod;
        return *this;
    }
    modint pow(long long r) const {
        if (!r) return 1;
        modint x = pow(r >> 1);
        x *= x;
        if (r & 1) x *= *this;
        return x;
    }
    modint inverse() const {
        return pow(mod - 2);
    }
    modint& operator/=(const modint r) {
        return (*this) *= r.inverse();
    }
    modint operator/(const modint r) const {
        modint res(*this);
        return res /= r;
    }
};
 
istream &operator>>(istream &is, modint &x) {
    long long t;
    is >> t;
    x = t;
    return is;
}
ostream &operator<<(ostream &os, const modint& x) {
    return os << x.a;
}
const int MAX = 500000;
modint fac[MAX], inv[MAX], finv[MAX];
void cominit() {
    fac[0] = fac[1] = 1;
    finv[0] = finv[1] = 1;
    inv[1] = 1;
    for(int i = 2; i < MAX; i++) {
        fac[i] = fac[i - 1] * modint(i);
        inv[i] = - inv[mod % i] * modint(mod / i);
        finv[i] = finv[i - 1] * inv[i];
    }
}
modint Com(long long n, long long k) {
    if(n < k) return 0;
    if(n < 0 || k < 0) return 0;
    return fac[n] * finv[k] * finv[n - k];
}
modint Per(long long n, long long k) {
    if(n < k) return 0;
    if(n < 0 || k < 0) return 0;
    return fac[n] * finv[n - k];
}
 
using Mint = modint;

const int mxN = 2e5 + 4;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, k;
    cin >> n >> k;
    Mint ans = Mint(k).pow(n);
    vector<Mint> per(min(mxN, k + 1), 1);
    for (int i = 1; i < (int) per.size(); i++) {
        per[i] = per[i - 1] * (k + 1 - i);
    }
    vector<pair<int, int>> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i].first >> a[i].second;
    }
    sort(a.begin(), a.end());
    Mint x = 1;
    for (int i = 0; i < n; i++) {
        int cnt = 1;
        int cur = i, rmax = a[i].second;
        while (cur < n - 1 && rmax > a[cur + 1].first) {
            cur++;
            cnt++;
            rmax = max(rmax, a[cur].second);
        }
        if (k < cnt) {
            x = 0;
            break;
        }
        x *= per[cnt];
        i = cur;
    }
    ans -= x;
    cout << ans << '\n';
}