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#include <cstdio>
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#include <cmath>
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using namespace std;
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int main()
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{
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double n;
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int m;
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while(~scanf("%lf%d",&n,&m))
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{
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double ans=0;
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for(int i=0;i<m;i++)
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ans+=n,n=sqrt(n);
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printf("%.2lf\n",ans);
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}
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return 0;
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}
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