#include <iostream>
#include <vector>
#include <math.h>
#include <atcoder/modint.hpp>

using namespace std;
using namespace atcoder;
using ll = long long;
using mint = modint998244353;

int main() {
  ll n, m;
  cin >> n >> m;
  mint ans = 0;
  vector<mint> f(n + 1, 1);
  for (ll i = 0; i < n; i++)
    f[i + 1] = f[i] * (i + 1);
  for (ll y = 0; y < n; y++) {
    ll x2 = y * y + m;
    ll x = sqrt(x2) - 2;
    while (x * x - y * y < m)
      x++;
    if (x * x - y * y != m)
      continue;
    if ((n - x - y) % 2)
      continue;
    if (n - x - y < 0)
      break;
    ll a = abs(n - x + y) / 2;
    ll b = abs(n - x - y) / 2;
    mint tmp = f[n] * f[n] / (f[a] * f[n - a] * f[b] * f[n - b]);
    if (y)
      tmp *= 4;
    else
      tmp *= 2;
    ans += tmp;
  }
  ans /= mint(4).pow(n);
  cout << ans.val() << "\n";
  return 0;
}