Arithmetic derivative by tails (rotary-o)

i,j,n;main(k,s){for(;k=~scanf("%s",s);printf(atof(s)?"Wait, that's not a number...\n":"%d\n",n))for(i=j=strtol(s,&s,n=0);j%k?j/--k:(n-=i/k,j/=k););}

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