import java.util.Random;
public class Main {
    public static void main(String[] args) {
        Random rand = new Random();
        int N = 10; 
        for(int i=0; i<N/2; i++){
            double u1 = rand.nextDouble(); 
            double u2 = rand.nextDouble();
            double r = Math.sqrt(-2 * Math.log(u1));
            double theta = 2 * Math.PI * u2;
            double z1 = r * Math.cos(theta);
            double z2 = r * Math.sin(theta);
            System.out.println(z1 + " " + z2); 
        }
    }
}
 

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