#include <bits/stdc++.h>
using namespace std;

int main()
{
	int N;
	double P;
	cin >> N >> P;
	
	if(N >= 200)
	{
		cout << 1 << endl;
		return 0;
	}
	
	double p = 1;
	for(int i = 0; i < N; i++) p *= (1 - P);
	double ans = 1 - p;
	cout << setprecision(20) << ans << endl;
	return 0;
}