// Produce TSP text file for points around in a circle.
// Usage: java CircleTxt 20 > circle20.txt

public class CircleTxt
{
    public static void main(String[] args)
    {
        int N = Integer.parseInt(args[0]);
        int diam = 500;
        System.out.printf("%d %d%n", diam, diam);
        double radius = diam/2.0;
        for (int k=0; k<N; ++k) {
            double radians = 2*k*Math.PI/N;
            double x = radius * (1 + Math.cos(radians));
            double y = radius * (1 + Math.sin(radians));
            System.out.printf("%.3f %.3f%n", x, y);
        }
    }
}