#include <iostream>
#include <cmath>
using namespace std;
void function(int a) {
int n = 0;
int k,m = 0;
while(a) {
    k = a % 2;
    a = a / 2;
    n += k * pow(10, m);
    m++;
}
cout << n << endl;
}

int main()
{
int a;
cin >> a;
function(a);
return 0;
}