do a bunch of stuff to a number by tails

i;j;main(a){for(;a-1||~scanf("%d\n",&a,i=j=i&&!vprintf(),a=j-i);a=a&1?a*3+1:a/2)j|=++i;}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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