#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define ll long long
#define rep(i,n) for (int i = 0; i < (n); i++)
#define coutf(f) cout << fixed << setprecision(f)
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()

int main() {
	int n;
	double p;
	cin >> n >> p;
	if (n >= 200) {
		cout << 1 << endl;
	}
	else {
		p = 1 - p;
		double ans = 1, cnt = 1;
		while (n--) cnt *= p;
		ans -= cnt;
		coutf(10) << ans << endl;
	}
	return 0;
}