#include <stdio.h>

int main() 
{
    int i;

    for (i = 0; i < 8; i++) 
    {
        switch (i) 
        {
            case 0:
                printf("000\n");
                break;
            case 1:
                printf("001\n");
                break;
            case 2:
                printf("010\n");
                break;
            case 3:
                printf("011\n");
                break;
            case 4:
                printf("100\n");
                break;
            case 5:
                printf("101\n");
                break;
            case 6:
                printf("110\n");
                break;
            case 7:
                printf("111\n");
                break;
        }
    }

    return 0;
}