#include <iostream>
#include <cmath>
using namespace std;
long long convertOctalToBinary(int);
long long convertOctalToBinary(int octalNumber) {
int decimalNumber = 0, i = 0;
long long binaryNumber = 0;
while(octalNumber != 0) {
decimalNumber += (octalNumber%10) * pow(8,i);
++i;
octalNumber/=10;
}
i = 1;
while (decimalNumber != 0){
binaryNumber += (decimalNumber % 2) * i;
decimalNumber /= 2;
i *= 10;
}
return binaryNumber;
}