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Bus.java

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package com.matsemann;

import java.io.FileInputStream;

import java.util.Scanner;

import static java.lang.Integer.parseInt;

public class Bus {

static Scanner sc;

public static void main(String[] args) throws Exception {

//System.setIn(new FileInputStream("inputs/bus.txt"));

sc = new Scanner(System.in);

int cases = parseInt(sc.nextLine());

while (cases --> 0) {

System.out.println((2 << parseInt(sc.nextLine()) - 1) - 1);

}

}

}