import sys
input = sys.stdin.readline

class BIT:
    def __init__(self, n):
        self.n = n
        self.bit = [0]*(n+1)
    
    def add(self, i, x):
        i += 1
        
        while i<=self.n:
            self.bit[i] += x
            i += i&(-i)

    def acc(self, i):
        s = 0
        
        while i>0:
            s += self.bit[i]
            i -= i&(-i)
        
        return s

N, K = map(int, input().split())
LR = [tuple(map(int, input().split())) for _ in range(N)]
LR.sort()
sub = 1
MOD = 998244353
bit = BIT(2*10**5+10)

for i in range(N):
    L, R = LR[i]
    sub *= K-(i-bit.acc(L+1))
    sub %= MOD
    bit.add(R, 1)

ans = (pow(K, N, MOD)-sub)%MOD
print(ans)