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#include <bits/stdc++.h>

using namespace std;

const int MOD = 1e9 + 7;

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n, maxa = 0;
    cin >> n;
    vector<int> a(n);
    for (auto& num : a){
        cin >> num;
        maxa = max(maxa, num);
    }

    if (maxa > 100){
        cout << 2137 << "\n";
        return 0;
    }

    int cnt = 0, act = 0;
    for (int i = 0; i < n; i++){
        act += a[i];
        if (act % 2 == 0){
            cnt++;
            act = 0;
        }
    }

    if (act != 0){
        cout << 0 << "\n";
        return 0;
    }

    long long ans = 1;
    for (int i = 1; i < cnt; i++)
        ans = (ans*2) % MOD;
    
    cout << ans << "\n";
    
    return 0;
}