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public class hello {
    public static void main(String[] args) {
        double pi = 0;        double res=0;        int cnt=1;        for (int i=1;i<=1000000000;i+=2) {
            if(cnt%2==1)
                res+=1.0/i;            else                res-=1.0/i;            cnt++;        }
        pi=res*4;        System.out.println(pi);    }
}

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