#include <iostream>
#define rep(i, l, n) for (int i = (l); i < (n); i++)
using namespace std;


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

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

	return 0;
}