public class t1 
{
	public static void main(String[] args) 
	{
		double pi4=0;
        int len,zec=Integer.parseInt(args[0]);
        long i,u,t=System.currentTimeMillis();
        for (i=0;i<=Integer.MAX_VALUE;i++)
        {
        	pi4=(Math.pow(-1,i))/(2*i+1)+pi4;
        	len=Double.toString(pi4*4).length();
        	if (len==zec+2) break;
        }
        u=System.currentTimeMillis();
        System.out.println("Pi cu "+zec+" zecimale este "+pi4*4);
        System.out.print("Timpul total de executie este de "+(u-t)+" milisecunde.");
	}

}