from collections import defaultdict
MOD = 998244353
N,M,K = list(map(int,input().split()))
A = list(map(int,input().split()))
A.sort()

now = defaultdict(int)
for i in A:
    now[i] += 1
for i in range(M-1):
    next = defaultdict(int)
    key = list(now.keys())
    l,r = 0,0
    S = 0
    for j in key:
        while(r < len(key) and j-K <= key[r] <= j+K):
            S += now[key[r]]
            S %= MOD
            r += 1
        
        while(l < len(key) and key[l] < j-K):
            S -= now[key[l]]
            S %= MOD
            l += 1
        
        next[j] += S
    now,next = next,now

print(sum(now.values()) % MOD)