Write a program to calculate the result of the formula pi in java 𝜋=4(1−1/3+1/5−1/7+1/9−1/11+1/13−⋯−1/2𝑖−1+1/2𝑖+1) with 10000 ≤ i ≤ 100000

import java.util.*;
public class Main {
    public static void main(String[] args) {
        int sum = 0;
        int n = 10000;
        for (int i = 10000; i <= 100000; i++) {
            if (i % 2 == 0)
                sum += -1 / (2 * i - 1);
            else
                sum += 1 / (2 * i - 1);
        }
        System.out.println(sum);
    }
}