import chess.Chess;

public class CalculatePi {
    
    public static void main(String[] args) {
        /* here you go */
        
        /* pi= 4 * ( 1.0 - 1/3. + 1/5. - 1/7. + 1/9. + ... ) */
        
        double pi= 1.0;
        double denominator=3;
        
        while ( denominator<100000000000. ) {
            pi= pi - 1 / denominator;
            pi= pi + 1 / ( denominator + 2);
            denominator= denominator + 4;
        }
        
        Chess.report( "pi="+(4 * pi)+" "+Math.PI );
        
        /* two braces below */
    }
    
}