#include <iostream>
#include <cmath>
using namespace std;
int convert(long long n);
int main() {
    long long n;
    cout << "Enter a binary number: ";
    cin >> n;
    cout << n << " in binary = " << convert(n) << " in decimal " << endl;
    return 0;
}
int convert(long long n) {
    int dec = 0, i = 0, rem;
    while (n != 0) {
        rem = n % 10;
        n /= 10;
        dec += rem * pow(2, i);
        ++i;
    }
    return dec;
}