19 lines
322 B
C++
19 lines
322 B
C++
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//http://acm.hdu.edu.cn/showproblem.php?pid=2009
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#include <cstdio>
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#include <cmath>
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int main(){
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int m;
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double n;
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while(scanf("%lf%d",&n,&m)!=EOF){
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double sum = 0;
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for(int i=0;i<m;i++){
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sum += n;
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n=sqrt(n);
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}
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printf("%.2f\n",sum);
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}
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return 0;
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}
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