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

int main()
{
	int N;
	double P;
	cin >> N >> P;

	double ans = 0;
	double n = P;
	for( int i = 0; i < N; i++ ) {
		ans += n;
		n *= (1 - P);
	}
	if( N >= 200 ) ans = 1;

	cout << fixed << setprecision(12) << ans << endl;
}