文件目录

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
    double x;
    int n;
    cin >> x >> n;
    double ans = 0;
    for (int i = 0; i <= n; i++)
    {
        double s = 1;
        int m = i;
        while (m--)
        {
            s *= x;
        }
        ans += s;
    }
    cout << fixed << setprecision(2) << ans;
    return 0;
}