import java.util.Arrays;

public class Test
{
    public static void main(String[] args) {
     int[] arr = new int[5];
        arr[0] = 1;
        arr[1] = 2;
        arr[2] = 3;
        arr[3] = 4;
        arr[4] = 5;
        int b = 3;
        int c = 4;
        while (c>0) {
        c = arr[b];
        arr[c] = arr[b];
        b--;
        c--;
        }
        arr[0] = 0;
        System.out.println(Arrays.toString(arr));
    }
}