import java.io.*; /** * 从第 N 天剩下一个桃子时退回第一天 */ public class Main { public static BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); public static BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out)); public static StreamTokenizer cin = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in))); public static PrintWriter cout = new PrintWriter(new OutputStreamWriter(System.out)); public static void main(String[] args) throws Exception { cin.nextToken(); int n = (int) cin.nval; int sum = 1; for (int i = n - 1; i > 0; i--) { sum = (sum + 1) * 2; } cout.print(sum); cout.flush(); } }
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