int n,kk1 = 0, kk2 = 0;
    scanf("%d", &n);
    for (int i = 0; i < n; i++) {
        int num;
        scanf("%d", &num);
        if (num%2 == 0) kk1++;
        else kk2++;
    }
    ll res = kk1*kk2;
    printf("%lld", res);
    return 0;