#include<bits/stdc++.h>
#define rep(i, l, n) for (int i = (l); i < (n); i++)
using namespace std;


int main(void) {
	int n;		cin >> n;
	double p;	cin >> p;

	assert(n >= 1 and n <= 1000 and p > 0 and p < 1.0);

	if (n >= 200) {
		cout << 1 << endl;
		return 0;
	}
	
	double a = 1.0;
	double q = 1.0 - p;
	rep(i, 0, n) {
		a *= q;
	}
	cout << (1.0 - a) << endl;

	return 0;
}