#include <iostream>
using namespace std;

int checkPaymentAmount(float amount, float balance, float interest); //forward declaration of the function, nasty C necessity

int main()
{
    //declaration of the variables we'll be using
    float balance, lowerBound, upperBound, interest, midValue;
    int check;

    cin >> balance; //input of the balance
    cin >> interest; //input of the annual interest
    lowerBound = balance / 12; //given in the pdf
    upperBound = (balance + balance * interest) / 12; //given in the pdf (I think lol)

    bool inLoop = true; //we will use this boolean later to check if we have found the correct amount
    while (inLoop)
    {
        midValue = lowerBound + (upperBound - lowerBound) / 2; //we calculate the interval size, divide it by two and add that to the lowerBound, this will be our center value
        check = checkPaymentAmount(midValue, balance, interest);
        if (check == 0)
            inLoop = false;
        if (check == 1)
            lowerBound = midValue;
        if (check == -1)
            upperBound = midValue;
    }

    printf("%.2f", midValue); //this will print the answer with a precision of 2 decimals

    return 0;
}

//returns 1 if amount needs to be higher, -1 is it needs to be lower, 0 if it's acceptable
int checkPaymentAmount(float amount, float balance, float interest)
{
    float tempBalance = balance;

    //first we need to calculate the amount payed off with the original balance, to see if this will be sufficient
    for (int i = 0; i < 12; i++)
    {
        tempBalance = tempBalance * (1 + interest/12) - amount; //this is also used in the first problem I think
    }

    if (tempBalance > 0)
        return 1; //if you still have dept after paying this amount monthly, your amount was not high enough

    //this code below will only be executed if we've paid too much. We need to find out if we could've paid less and still pay off.
    //We will do this by checking if the amount - 0.01 gives us an amount in debt

    tempBalance = balance;
    amount = amount - 0.01;
    for (int i = 0; i < 12; i++)
    {
        tempBalance = tempBalance * (1 + interest/12) - amount;
    }

    if (tempBalance > 0)
        return 0; //We have a dept now, so our initial amount was the littlest amount possible and we need to stop the loop
    else
        return -1; //this value was too high, so we need to search lower values
}