i;main(){while(++i<16)printf("%d-->%d\n",(i&i-1)%3,((i|i-1)+1)%3);}
//main(i,v)char**v;{for(i=1;i<1<<atoi(v[1]);i++)printf("%d-->%d\n",(i&i-1)%3,
//((i|i-1)+1)%3);}