import java.io.*;
public class report2b3c {
    /**
     * @param args the command line arguments
     */
	public static void main(String[] args) throws Exception {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
                System.out.println("2のn乗を計算します。");
		System.out.println(":n= ");
		int n = (new Integer(in.readLine())).intValue();
                int l = 0;
                int v = 1;
                while(l < n) {
                    l = l+1;
                    v = v*2;
                }
                System.out.println("2の" + n + "乗は" + v + "です。" );
               
	}
}