#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
    int n;
    double p;
    cin >> n >> p;
    if(n >= 200){
        cout << 1 << endl;
        return 0;
    }
    double q = 1;
    for(int i = 0; i < n; i++) q = q * (1 - p);
    cout << fixed << setprecision(15) << 1 - q << endl;
}