// This program converts octal numbers to decimal numbers.

import java.util.Scanner;

public class Decimal
{
    public static void main ( String args[] )
    {
        int foo;
        Scanner sc = new Scanner ( System.in );
      
        do 
        {
            System.out.print ("Enter up to an 8-digit octal number and I'll convert it: ");
            foo = sc.nextInt();
        }
        
        while (foo < 0 || foo > 99999999);

        System.out.printf ( "%d:%d\n", foo, convert(foo));
    }

    /** 
     * This method converts an octal number to a decimal number
     *
     * @param octal the octal number to be converted to decimal
     * @return decimal the octal number converted to decimal
     */

    public static int convert ( int octal ) 
    {
        int temp, decimal, num1, num2;
        num1 = 10000000;
        num2 = 2097152;
        decimal = 0;
        
        while ( num1 > 0 )
        {
            temp = ((octal / num1)% 10)* num2;
            num1 /= 10;
            num2 /= 8;
            decimal += temp;
        }
        
        return decimal; 
    } 
}