public void Run()
{
N = Input.ReadInt();
S = Console.ReadLine();
L = S.Length;
var DP = new long[N + 1, N + 1];
DP[0, 0] = 1;
for (int i = 0; i < N; i++)
{
for (int j = 0; j <= N; j++)
{
int p = Math.Min(j + 1, N);
int m = Math.Max(j - 1, 0);
DP[i + 1, p] += DP[i, j] * 2;
DP[i + 1, p] %= MOD;
DP[i + 1, m] += DP[i, j];
DP[i + 1, m] %= MOD;
}
}
long ret = DP[N, L];
var comb = new FermatCombination(2);
for (int i = 0; i < L; i++)
{
ret *= comb.Inverse[2];
ret %= MOD;
}
Console.WriteLine(ret);
}
public void Run()
{
{
var line = Input.ReadLongArray();
N = line[0];
A = line[1];
B = line[2];
K = line[3];
}
var comb = new FermatCombination(300000);
long ret = 0;
for (long a = 0; a <= N; a++)
{
long R = K - a * A;
if (R >= 0 && R % B == 0 && R / B <= N)
{
long b = R / B;
ret += comb.Combination(N, a) * comb.Combination(N, b);
ret %= M;
}
}
Console.WriteLine(ret);
}
public void Run()
{
var comb = new FermatCombination(1000000);
N = Input.ReadInt();
long ret = 0;
{
var v = comb.Permutation(N - 1, N - 1);
ret += (v * (N)) % MOD;
ret %= MOD;
}
for (int k = 0; k < N; k++)
{
// C(K ? 1, N ? 1 ? K) × K! × (N ? 1 ? K)!
if (k - 1 < N - 1 - k)
{
continue;
}
var v1 = comb.Combination(k - 1, N - 1 - k);
var v2 = comb.Permutation(k, k);
var v3 = comb.Permutation(N - 1 - k, N - 1 - k);
var v = (((v1 * v2) % MOD) * v3) % MOD;
ret += (MOD - v);
ret %= MOD;
}
Console.WriteLine(ret);
}
public void Run()
{
N = Input.ReadInt();
A = Input.ReadLongArray();
var comb = new FermatCombination(200000);
long[] S = new long[N];
var p = comb.Permutation(N, N);
for (int i = 0; i < N; i++)
{
long c = p;
c *= comb.Inverse[i + 1];
c %= MOD;
c *= comb.Permutation(i, i);
c %= MOD;
// c /= (i + 1);
// Console.Error.WriteLine("{0} {1}", i, c);
S[i] = (i == 0 ? 0: S[i - 1]) + c;
S[i] %= MOD;
}
long ret = 0;
for (int i = 0; i < N; i++)
{
int r = N - i - 1; // N - 1.. 0
int l = i; // 0.. N - 1;
long c = 0;
c += S[r];
c %= MOD;
c += S[l];
c %= MOD;
c += (MOD - S[0]);
c %= MOD;
ret += (c * A[i]) % MOD;
ret %= MOD;
}
Console.WriteLine(ret);
}