#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include <map>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <stack>
#include <algorithm>
#include <array>
#include <unordered_set>
#include <unordered_map>
#include <string>
using namespace std;

bool rcmp(int a, int b) { return a>b; }
typedef long long LL;



typedef struct { int s, e; } RNode;
RNode rs[100004];
bool mycmp(const RNode& a, const RNode& b) { return a.s<b.s; }
int sx[100004];
#define MOD 998244353
int main() {
    int n, i, k, ck, s, e, j, nj, d, cc;
    LL b, r, bb, v, t;
    scanf("%d %d", &n, &k);
    for (i=0; i<n; i++) scanf("%d %d", &rs[i].s, &rs[i].e);
    r=1; for (i=1; i<=n; i++) { r*=k; r%=MOD; }
    sort(rs, rs+n, mycmp);
    bb=1;
    for (i=n-1; i>=0; i--) {
        s=rs[i].s; e=rs[i].e-1;
        j=i; d=n-i; while(d) {
            while(1) {
                nj=j+d; if (nj>=n) break;
                if (rs[nj].s>e) break;
                j=nj;
            }
            d>>=1;
        }
        cc=j-i;
        if (cc>=k) { bb=0; break; }
        bb*=(k-cc); bb%=MOD;
    }
    r-=bb; if (r<0) r%=MOD;
    printf("%lld\n", r);
    return 0;
}