//* How to convert a decimal number into a binary number
#include <bits/stdc++.h>
using namespace std;
class NumberConversion
{
int n = 0, count = 0, ans = 0;
public:
void decimalToBinary(int n)
{
this->n = n;
while (this->n != 0)
{
int rem = this->n % 2;
this->n /= 2;
ans += rem * pow(10, count);
count++;
}
}
void display()
{
cout << ans << endl;
}
};
int main()
{
int number = 0;
cin >> number;
NumberConversion num1;
num1.decimalToBinary(number);
num1.display();
return 0;
}