def main():
    import sys
    input = sys.stdin.readline
    MOD = 998244353
    N,M,K = list(map(int,input().split()))
    A = list(map(int,input().split()))
    A.sort()

    now = [1] * N
    for i in range(M-1):
        next = [0] * N
        l,r = 0,0
        S = 0
        for j in range(N):
            while(r < N and A[j]-K <= A[r] <= A[j]+K):
                S += now[r]
                S %= MOD
                r += 1
            
            while(l < N and A[l] < A[j]-K):
                S -= now[l]
                S %= MOD
                l += 1
            next[j] += S
        now,next = next,now

    ans = 0
    for i in now:
        ans += i
        ans %= MOD
    print(ans)
main()