#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#include<string.h>
void main()
{
    unsigned long i,*p;
    int n;
    printf("input n:");
    scanf("%d",&n);
    p=(unsigned long*)malloc(pow(2,n)*sizeof(unsigned long));
    for(i=0;i<=pow(2,n)-1;i++)
    {
        p[i]=i;
        printf("%lu\n",p[i]);
    }
    getchar();
    getchar();
}