calc equation by rotary-o

i,j,k=1;main(l,c){main(i?l:c/2?k*=c/18?j*=c/46?l:!printf("%.d\n",j),l:-1:-c*k,getchar(i=c%15<4?j-=i*l,0:i*10+c-4)-44);}

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