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

int main() {
	long double ans = 0;
	long double k; cin >> k;
	for (int i = 1; i <= 10; i++) {
		ans += sin(k * (long double)i) / (pow(i, i));
	}
	cout << fixed << setprecision(15);
	cout << ans << endl;
	return 0;
}