public static void main(String[] args) { /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */

    Scanner s = new Scanner(System.in);

    int n=s.nextInt();

    int l=0,x=0;

    ArrayList<Integer> al = new ArrayList();

    while(x<n){
        x = 1 << l;
        al.add(x);
    }

    int[] count = new int[n+1];

    count[0]=1;

    for(int i=1;i<n+1;i++){
        for(int j=0;j<al.size();j++){
            if(i>=al.get(j))
                count[i]+=count[i-al.get(j)];
        }
    }
    int k=count[n];
    System.out.println(k);
}

what is the problem..showing:unsafe operations