#include <iostream>
#include <cmath>

using namespace std;

int main(int argc, char * argv[])
{

    double S = 1000000, m = 14749, n = 10;

    double r = 0.5, old = 0, epsilon = 1e-8;

    for(;abs(r - old) > epsilon;)
    {
        old = r;
        r = 12*m/S*(1 - 1/pow(1+old,n));
    }

    cout << r*100 << endl;


}