trecere din 10 in 2

#include<iostream>
using namespace std;
long long trece( long long x10)
{
    long long cifra, p10=1, xb=0;
    while(x10)
    {
        cifra=x10%2;
        xb=xb+cifra*p10;
        p10=p10*10;
        x10=x10/2;
    }
    return xb;
}
int main()
{
    long long x, y;
    cin>>x;
    y=trece(x);
    cout<<y;
    return 0;
}