// Find the value of PI by Monte Carlo
import java.util.Random;
public class MonteCarloPI {

	private long trials=100;
	private Random generator = new Random();

	public MonteCarloPI( long trials ) { this.trials = trials; }

	private int countHits(){
		double x, y;
		int hits=0;
		for(long i=0; i<trials; i++){
			x = generator.nextDouble();
			y = generator.nextDouble();
			if( x*x + y*y < 1 ) hits++;
		}
		return hits;
	}

	public double getValue(){ return (4. * countHits() / trials); }

	public static void main( String args [] ){
		MonteCarloPI PI = new MonteCarloPI(10000000);
		System.out.printf("Monte Carlo PI = %.5f\n", PI.getValue());
	}
}