mod = 998244353
n,m,K = map(int,input().split())
X = tuple(map(int,input()))
dp = [0]*(n+1)
dp[n] = 1
C = [[0]*(n+1) for _ in range(n+1)]
C[0][0] = 1
for i in range(n):
    C[i+1][0] = 1
    for j in range(i+1):
        C[i+1][j+1] = (C[i][j]+C[i][j+1])%mod
T = [1]*(n+1)
for i in range(n):
    T[i+1] = T[i]*2%mod
for x in X:
    ndp = [0]*(n+1)
    if x == 0:
        for j in range(n+1):
            for k in range(j+1):
                ndp[k] += dp[j]*C[j][j-k]%mod*T[n-j]%mod
    else:
        for j in range(K,n+1):
            t = 0
            for k in range(j-K+1,j+1):
                t = (t+C[j][k])%mod
            ndp[j] = dp[j]*T[n-j]%mod*t%mod
    dp = ndp
ans = sum(dp[K:])%mod
print(ans)