float x,y;s;main(a,n){for(;1/y<2e3||~scanf("%d,%d,%f",&a,&n,&x,s/=4.3);s=44)printf("%s%.3f",&s,x-=y=x*(1-a/pow(x,n))/n-1e-6);}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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