import sys
from collections import Counter
readline=sys.stdin.readline

N,K=map(int,readline().split())
A=list(map(int,readline().split()))
mod=998244353
C=Counter(A)
DP=[1]
s=0
for a in sorted(list(C.keys())):
    c=C[a]
    dp=[[[0]*(s*c+1) for j in range(c+1)] for i in range(s+1)]
    dp[0][0][0]=1
    for i in range(s+1):
        for j in range(c+1):
            for k in range(s*c+1):
                if i:
                    dp[i][j][k]+=dp[i-1][j][k]
                if j and k-i>=0:
                    dp[i][j][k]+=dp[i][j-1][k-i]
                dp[i][j][k]%=mod
    PREV=DP
    DP=[0]*((s+c)*(s+c-1)//2+1)
    for i in range(s*(s-1)//2+1):
        for j in range(s*c+1):
            DP[i+j]+=PREV[i]*dp[-1][-1][j]
            DP[i+j]%=mod
    s+=c
ans=DP[K]
print(ans)