#include <iostream>

using namespace std;

int main()
{
    int nr,cat,rest,v[10],a[10],i,j;
    cout<<"nr=";cin>>nr;
    i=0;
    while(nr)
    {
        i+=1;
        cat=nr/2;
        rest=nr%2;
        v[i]=rest;
        nr=cat;
    }
    int x;
    x=i;
    for(j=1;j<=x;j++)
    {
        a[j]=v[i];
        i-=1;
    }
    for(j=1;j<=x;j++)
    {
        cout<<a[j];
    }
}