using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[] NMi => ReadLine().Split().Select(c => int.Parse(c) - 1).ToArray();
    static int[][] NMap(int n) => Enumerable.Repeat(0, n).Select(_ => NMi).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (n, m, k) = (c[0], c[1], c[2]);
        var x = ReadLine();
        var mod = 998_244_353;
        var ans = CountX(n, m, k, x, mod);
        if (x.Any(c => c == '0'))
        {
            var x2 = x.ToCharArray();
            for (var i = x2.Length - 1; i >= 0; --i)
            {
                if (x2[i] == '0')
                {
                    x2[i] = '1';
                    break;
                }
                else
                {
                    x2[i] = '0';
                }
            }
            ans = (ans + mod - CountX(n, m, k, string.Concat(x2), mod)) % mod;
        }
        WriteLine(ans);
    }
    static long CountX(int n, int m, int k, string x, int mod)
    {
        var dp = new long[m + 1, n + 1];
        dp[0, n] = 1;
        var ncr = new NCR(n + 1, mod);
        for (var i = 0; i < m; ++i) for (var j = 0; j <= n; ++j)
        {
            if (x[i] == '0')
            {
                for (var one = 0; one <= j; ++one) dp[i + 1, j - one] = (dp[i + 1, j - one]
                    + dp[i, j] * ncr.Calc(j, one) % mod * ncr.Exp(2, n - j) % mod) % mod;
            }
            else
            {
                for (var zero = 0; zero <= j && zero < k; ++zero) dp[i + 1, j] = (dp[i + 1, j]
                    + dp[i, j] * ncr.Calc(j, zero) % mod * ncr.Exp(2, n - j) % mod) % mod;
            }
        }
        var ans = 0L;
        for (var i = 0; i <= n; ++i) ans = (ans + dp[m, i]) % mod;
        return ans;
    }
    class NCR
    {
        int[] facts;
        int[] revFacts;
        int mod;
        public NCR(int n, int mod)
        {
            facts = new int[n + 1];
            revFacts = new int[n + 1];
            this.mod = mod;
            facts[0] = 1;
            var tmp = 1L;
            for (var i = 1; i <= n; ++i)
            {
                tmp = tmp * i % mod;
                facts[i] = (int)tmp;
            }
            tmp = Exp(facts[n], mod - 2);
            revFacts[n] = (int)tmp;
            for (var i = n; i > 1; --i)
            {
                tmp = tmp * i % mod;
                revFacts[i - 1] = (int)tmp;
            }
            revFacts[0] = 1;
        }
        public long Exp(long n, long k)
        {
            n = n % mod;
            if (k == 0) return 1;
            if (k == 1) return n;
            var half = Exp(n, k / 2);
            var result = half * half % mod;
            return ((k % 2) == 0) ? result : (result * n % mod);
        }
        public long Calc(int n, int r)
        {
            return (long)facts[n] * revFacts[r] % mod * revFacts[n - r] % mod;
        }
        /// <summary>nが大きくrが小さい場合の計算</summary>
        public long Calc2(int n, int r)
        {
            var tmp = 1L;
            for (var i = 0; i < r; ++i)
            {
                tmp = tmp * (n - i) % mod;
            }
            return tmp * revFacts[r] % mod;
        }
        public long NPR(int n, int r)
        {
            return (long)facts[n] * revFacts[r] % mod;
        }
        public long Fact(int n)
        {
            return facts[n];
        }
        public long RevFact(int n)
        {
            return revFacts[n];
        }
        public long Inverse(int n)
        {
            return (long)revFacts[n] * facts[n - 1] % mod;
        }
    }
}