public static String getZorZe(int count) {
        count = Math.abs(count);
        switch (count) {
            case 2:
            case 3:
            case 4:
            case 7:
            case 14:
            case 17:
            case 40:
            case 60:
            case 70:
            case 100:
                return "ze";
            case 0:
            case 200:
                return "z";
        }
        if (count > 100 && count < 200)
            return "ze";

        int firstDigit = firstDigit(count);
        // nevokalizujeme "tř"/13/30+ http://prirucka.ujc.cas.cz/?ref=111&id=770
        return (firstDigit == 2 || firstDigit == 4 || firstDigit == 7) ? "ze" : "z";
    }

    public static int firstDigit(int n) {
        while (n < -9 || 9 < n) n /= 10;
        return Math.abs(n);
    }