class Ideone {
    private static int popcount(int i) {
        return Integer.bitCount(i);
    }
    public static void main(String[] args) {
        System.out.println(popcount('a'));
        System.out.println(popcount(127));
        System.out.println(popcount(255));
        System.out.println(Integer.MAX_VALUE);
        System.out.println(popcount(Integer.MAX_VALUE));
    }
}