import java.math.BigInteger;
import java.util.Scanner;


public class Bit_Flipper {

	public static void main(String[] args) {

		Scanner input = new Scanner(System.in);
		long n=input.nextLong();
		String nBinary=Long.toBinaryString(n);
		String zerosTo64="";
		for (int i=1;i<=64-nBinary.length();i++)
		{
			zerosTo64="0"+zerosTo64;
		}
		nBinary=zerosTo64+nBinary;
		// TODO Auto-generated method stub
		char [] nBinaryAsString=nBinary.toCharArray();
		for (int i=0;i<nBinaryAsString.length-2;i++)
		{
			if (nBinaryAsString[i]==nBinaryAsString[i+1]&&nBinaryAsString[i+1]==nBinaryAsString[i+2])
			{
				if (nBinaryAsString[i]=='0')
					{
					nBinaryAsString[i]='1';
					nBinaryAsString[i+1]='1';
					nBinaryAsString[i+2]='1';

					}
				else
				{
					nBinaryAsString[i]='0';
					nBinaryAsString[i+1]='0';
					nBinaryAsString[i+2]='0';
				}
				i=i+2;
			}

		}
String finalString = new String(nBinaryAsString);
BigInteger decimalValue = new BigInteger(finalString, 2);
System.out.print(decimalValue);
	}

}