prob

#include <iostream>
#include <climits>
#include <cmath>

using namespace std;

int n;
double x, y;

double dist;

double calcdis (double x1, double y1) {
	return sqrt(pow(x-x1, 2) + pow(y-y1, 2));
}

void solve(int currSec, double cx, double cy, int angle) {
	if (currSec > n) return;

	dist = calcdis(cx + (10 * cos(M_PI * angle / 180.0)), cy + (10 * sin(M_PI * angle / 180.0)));

	solve(currSec+1, cx + (10 * cos(M_PI * angle / 180.0)), cy + (10 * sin(M_PI * angle / 180.0)), angle);
	solve(currSec+1, cx, cy, (angle+45) % 360);
}

int main(void) {
	int t; cin >> t;

	while (t--) {
		cout << dist << endl;
		cin >> n >> x >> y;

		dist = calcdis(0, 0);

		solve(1, 0.0, 0.0, 0);
		solve(1, 0.0, 0.0, 45);

		cout << dist << endl;
	}

	return 0;
}