import sys
input = sys.stdin.readline

mod=998244353

N,M,K=map(int,input().split())
A=list(map(int,input().split()))

A.sort()

MAX=[-1]*N

ind=0
for i in range(N):
    while ind<N and A[ind]-A[i]<=K:
        ind+=1
    MAX[i]=ind

MIN=[-1]*N
ind=0
for i in range(N):
    while ind<N and A[i]-A[ind]>K:
        ind+=1
    MIN[i]=ind

DP=[1]*N

for i in range(M-1):
    NDP=[0]*N

    S=[0]
    for x in DP:
        S.append(S[-1]+x)

    for j in range(N):
        NDP[j]=S[MAX[j]]-S[MIN[j]]

    DP=[x%mod for x in NDP]

print(sum(DP)%mod)