main(e,m,z,i){for(;~scanf("%d%d",&e,&m);printf("%d\n",z))for(z=i=46;--i;z=fmin(z,fmax(-~e/2-i,(m-1+i)/i+2)*(i+2)-e-m));}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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