Real Name: You'll never know m8 :P cuz you will only know me in real life m8 i r8 10/10 if ye know me


#include<iostream>
using namespace std;
long long int b2d(long long int bin, long long int dec, long long int base)
{
if (bin > 0) return b2d(bin/10, dec+(base*(bin%2)), base*2);
else return dec;
}
int main()
{
long long int bin; cin >> bin;
cout << b2d(bin, 0, 1) << endl;
return 0;
}