/*
Задание 5.
*/

#include <cmath>
#include <iomanip>
#include <iostream>

using namespace std;

int main() {
    double x;
    double eps;
    cin >> x >> eps;

    double result = x;
    uint64_t i = 2;
    uint64_t factorial = 1;
    double val = 0;

    double cur_val = INT_MAX;
    while (abs(cur_val) > eps) {
        cur_val = pow(x, i) / factorial;
        factorial *= i;
        i++;
        result += cur_val;
    }

    const int PRECISION = 15;
    cout << fixed << setprecision(PRECISION) << result;

    return 0;
}