#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
int main()
{
int n;
double m,s;
while (cin >> n>>m)
{
s = 0;
double j=n;
for (int i = 1; i <= m; i++)
{
s = s + j;
j = sqrt(j);
}
cout << setprecision(2) << fixed << s << endl;
}
}
杭电OJ2009
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