#include <iostream>
using namespace std;

int main() {
	int N; double P;
	cin >> N >> P;
	if(N >= 200) cout << 1 << endl;
	else {
		double answer = 1;
		P = (double)1 - P;
		for(int i = 0; i < N; i++) {
			answer *= P;
		}
		answer = (double)1 - answer;
		printf("%.10f\n", answer);
	}
	return 0;
}