#include <iostream> using namespace std; int main() { int a; cin >> a; if (a == 0) { cout << 0; return 0; } long long b = 0; long long c = 1; while (a > 0) { int d = a % 2; b = b + d * c; c *= 10; a = a / 2; } cout << b << endl; return 0; }