import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

"""


"""
mod = 998244353
n, m, k = na()
a = sorted(na())
l, r = [-1] * n, [-1] * n
from bisect import *
for i in range(n):
    # a[i] - k <= a[j] < a[i] + k + 1
    l[i] = bisect_left(a, a[i] - k)
    r[i] = bisect_left(a, a[i] + k + 1)

dp = [1] * n

for i in range(m-1):
    rui = [0] + dp
    for i in range(n):
        rui[i+1] += rui[i]
        rui[i+1] %= mod
    
    dp = [0] * n
    for i in range(n):
        dp[i] = (rui[r[i]] - rui[l[i]]) % mod


print(sum(dp) % mod)