#include<stdio.h>
int main(){
    int c[6]={0,0,0,0,0,0};
    while(c[0]<=1){
        for (int i=0;i<6;i++){
            printf("%d",c[i]);
        }
        printf("\r\n");
        c[5]+=1;
        for (int i=5;i>0;i--){
            if (c[i]>1){
                c[i]=0;
                c[i-1]+=1;
            }
        }
    }

    return 0;
}