from bisect import bisect_right
MOD = 998244353
INFTY = 2*10**5+10
N,K = map(int,input().split())
A = sorted([list(map(int,input().split())) for _ in range(N)],key=lambda x:x[0])
A = sorted(A,key=lambda x:x[1])
A = [(A[i][1],A[i][0]) for i in range(N)]
Deg = [0]*N
for i in range(1,N):
    r,l = A[i]
    ind = bisect_right(A,(l,INFTY))
    Deg[ind] += 1
    Deg[i] += -1
for i in range(1,N):
    Deg[i] += Deg[i-1]
ans = 1
for i in range(N):
    ans = (ans*(K-Deg[i]))%MOD
print((pow(K,N,MOD)-ans)%MOD)