22 lines
527 B
Java
22 lines
527 B
Java
// Author: Rodney Shaghoulian
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// Github: github.com/RodneyShag
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// HackerRank: hackerrank.com/RodneyShag
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import java.util.Scanner;
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public class Solution {
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public static void main(String[] args) {
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Scanner scan = new Scanner(System.in);
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int n = scan.nextInt();
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scan.close();
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int people = 2;
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int count = 2;
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for (int i = 2; i <= n; i++) {
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people = (people * 3) / 2;
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count += people;
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}
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System.out.println(count);
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}
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}
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