#include <iostream> using namespace std; int main() { int n; cin >> n; if (n == 0) { cout << 0 << endl; return 0; } int bin[20]; int len = 0; while (n > 0) { bin[len++] = n % 2; n = n / 2; } for (int i = len - 1; i >= 0; i--) { cout << bin[i]; } cout << endl; return 0; }