#include <string.h>
#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <ctime>
#include <deque>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <memory>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
using namespace std;

constexpr int mod = 998244353;

long long fac[2000005], finv[2000005], inv[2000005];

void COMinit() {
    fac[0] = fac[1] = finv[0] = finv[1] = inv[1] = 1;
    for (int i = 2; i < 2000005; i++) {
        fac[i] = fac[i - 1] * i % mod;
        inv[i] = mod - inv[mod % i] * (mod / i) % mod;
        finv[i] = finv[i - 1] * inv[i] % mod;
    }
}

long long COM(int n, int k){
    if (n < k) return 0;
    if (n < 0 || k < 0) return 0;
    return fac[n] * (finv[k] * finv[n - k] % mod) % mod;
}

long long choose(int n,int k) {
    if(n < 0 || k < 0) return 0;
    if(n == 0) return 1;
    return COM(n+k-1,k-1);
}

long long modpow(long long a,long long b) {
    long long ans = 1;
    while(b) {
        if(b & 1) {
            (ans *= a) %= mod;
        }
        (a *= a) %= mod;
        b /= 2;
    }
    return ans;
}

void mpl(int &x,int y) {
    x += y;
    if(x >= mod) x -= mod;
}

int main() {
    COMinit();
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N;
    long long M;
    cin >> N >> M;
    long long m = abs(M);
    vector<long long>tmp;
    for(long long i = 1; i*i <= m; i++) {
        if(m%i == 0) {
            tmp.push_back(i);
            if(i*i != m) tmp.push_back(M/i);
        }
    }
    int sum = 0;
    for(int i = 0; i < tmp.size(); i++) {
        long long a = tmp[i],b = M/tmp[i];
        if(abs(a)%2 != N%2 || a > N || a < -N) continue;
        if(abs(b)%2 != N%2 || b > N || b < -N) continue;
        long long p1 = (a+N)/2,p2 = (N-a)/2;
        long long p3 = (b+N)/2,p4 = (N-b)/2;
        mpl(sum,COM(N,p1)*COM(N,p3)%mod);
    }
    mpl(sum,sum);
    cout << sum*modpow(modpow(4,N),mod-2)%mod << "\n";
}