// モンテカルロ法による円の面積の計算

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

public class Circle{
    public static void main(String[] args) throws IOException {
	double x,y,ran;
	String s;

        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 trials");
        s = buf.readLine();
        long ntrial = Long.parseLong(s);

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

	double r0=1.0;              
	double r02=r0*r0;
	long nin=0;
	
	for(int i=0; i < ntrial; i++){
	    ran=rnd.nextDouble();
	    x=ran;
	    ran=rnd.nextDouble();
	    y=ran;
	    double r2=x*x+y*y;
	    if(r2 < r02) nin=nin+1;
	}

	double area=4.0 * ((double)nin/(double)ntrial);
	
	System.out.println("ntrial="+ntrial+" area= "+area);	    
	
    }

}