import itertools
MOD = 998244353
n,K,*a = map(int,open(0).read().split())
r = [1]+[0]*K
for c in range(1,n+1):
    for i in range(K+1-c)[::-1]:
        r[i+c] = (r[i+c]-r[i])%MOD
for k,v in itertools.groupby(sorted(a)):
    for c in range(1,len([*v])+1):
        for i in range(K+1-c):
            r[i+c] = (r[i+c]+r[i])%MOD
print(r[K])