//no-unlocked
#define MD 998244353
{
	ll @N, @K;
	Mint up = 1, down = 1;
	rep(N) {
		ll @A;
		if(A >= K) {
			up *= K; up /= A;
			down *= K - 1; down /= A;
		}
	}
	wt(up - down);
}