#include <bits/stdc++.h>
using namespace std;
using ll = long long;
constexpr ll mod = 998244353;
ll mod_pow(ll a, ll b) {
    if (!b) return 1;
    if (b & 1) return mod_pow(a, b - 1) * a % mod;
    return mod_pow(a * a % mod, b >> 1);
}
int main() {
    ll N, M; cin >> N >> M;
    ll x = 0;
    for (int i = 0; i < N + M; ++i) {
        ll a; cin >> a;
        x ^= a;
    }
    if (x != 0) puts("0");
    else cout << mod_pow(2, 20 * (N - 1) * (M - 1)) << endl;
}