import java.util.*;
import java.lang.*;
import java.io.*;

class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner in = new Scanner(System.in);
		double a, b, h;
    	//cin >> a >> b>> h;
    	a = in.nextDouble();
    	b = in.nextDouble();
    	h = in.nextDouble();
    	for (double x = a; x <= b; x += h) {
        	System.out.printf("%.3f %.3f\n", x, 3 * Math.sin(x));
    	}
	}
}