#include <bits/stdc++.h>
#define f first
#define s second
using namespace std;
typedef long long int ll;

void routine(){
	ll n;
	double p;
	cout << fixed << setprecision(7);
	cin >> n >> p;
	if(n >= 200){
		cout << 1;
		return;
	}
	double ans = 0;
	double start = 1.0;
	for(ll i = 0;i <= n;i++){
		ans += start*p;
		start *= (1-p);
	}
	cout << fixed << setprecision(7) << ans;
	return;
}

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	ll t = 1;
	while(t--){
		routine();
	}
	return 0;
}