import java.io.*;
import java.lang.*;

public class  OctalToDecimal{
	public static void main(String[] args)throws IOException{
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
		System.out.println("Enter the octal number:");
		String oct = reader.readLine();
		int i= Integer.parseInt(oct,8);
		System.out.println("Decimal:=" + i);
	}
}