// 2次元ランダムウォーク 

import java.util.Random;
import java.io.*;

public class RandomWalk2Da{
    public static void main(String[] args) throws IOException {
	int MAX_PARTICLES=10000;
	double x[]=new double[MAX_PARTICLES];
	double y[]=new double[MAX_PARTICLES];
	double h=1.0;
	String s;

	PrintWriter pw = new PrintWriter(new FileWriter("2D.dat"));

        BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Input: random seed");
        s = buf.readLine();
        long seed = Long.parseLong(s);
        System.out.println("Input: Number of particles");
        s = buf.readLine();
        long nran = Long.parseLong(s);
        System.out.println("Input: Number of steps");
        s = buf.readLine();
        long nstep = Long.parseLong(s);

        Random rnd = new Random();
        rnd.setSeed(seed); 

        for (int i = 0; i <= nran-1; i++) {

	    x[i]=0.0;
	    y[i]=0.0;

	    for(int istep=0; istep < nstep; istep++){
		double ran=rnd.nextDouble();
		if(ran<0.25)
		    x[i]=x[i]-h;
		else if(ran<0.5)
		    x[i]=x[i]+h;
		else if(ran<0.75)
		    y[i]=y[i]-h;
		else
		    y[i]=y[i]+h; 
	    }

	    System.out.println(x[i]+"   "+y[i]);	    
	    pw.println(x[i]+"   "+y[i]);	    

        }

	pw.close();
        	
    }

}