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public class Main {

    public static void main(String[] args) {

        double pi = 0;

        int p=1;

        for (int i=1;i<999;i=i+2) { 

                pi=pi+1.0/i*p;

                p=-p;

            // TODO

        }

        System.out.println(pi*4);

    }

}


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