#include <iostream>
#include <cmath>

using namespace std;
int octalToDecimal(int octalNumber);
// Function to convert octal number to decimal
int octalToDecimal(int octalNumber)
{
  int decimalNumber = 0, i = 0, rem;
  while (octalNumber != 0)
  {
    rem = octalNumber % 10;
    octalNumber /= 10;
    decimalNumber += rem * pow(8, i);
    ++i;
  }
  return decimalNumber;
}