#include <iomanip>
#include <iostream>

int main() {
    int n;
    double r, ans = 0.0;
    std::cin >> n >> r;
    r = 1 - r;
    
    double x = 100.0;
    for (int i = 0; i < n; i++) {
        ans += x;
        x *= r;
    }
    std::cout << std::fixed << std::setprecision(12);
    std::cout << ans << std::endl;
}