#include <bits/stdc++.h>
using namespace std;

void fast_io() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
}

int main() {
	fast_io();
	int k;
	cin >> k;
	long double ans = 0;
	for (int n = 1; n <= 9; n++) {
		ans += sin(k * n) / pow(n, n);
	}
	cout << setprecision(16) << fixed << ans << endl;
}