#yukicoder570

#A-D 省略

#E
#入力受取 Aをソート
N, M, K = map(int, input().split())
A = sorted(int(Ai) for Ai in input().split())
MOD = 998244353

#sub[i]: ドミノiとの大きさの差がK以下の[Lt, Rt)
sub: list[tuple[int, int]] = [(0, 0)] * N
for i in range(N):
    for Lt in range(i - 1, -2, -1):
        if Lt == -1 or abs(A[Lt] - A[i]) > K:
            break
    Lt += 1
    for Rt in range(i + 1, N + 1, +1):
        if Rt == N or abs(A[Rt] - A[i]) > K:
            break
    sub[i] = (Lt, Rt)

#累積和DP
DP: list[int] = [1] * N
C: list[int] = [0] * (N + 1)
for _ in range(M - 1):
    for i in range(N):
        C[i + 1] = (C[i] + DP[i]) % MOD
    for i, (Lt, Rt) in enumerate(sub):
        DP[i] = C[Rt] - C[Lt]
ans: int = sum(DP) % MOD
if ans < 0:
    ans += MOD
print(ans)