#include <iostream>
#include <vector>
#include <cstring>
#include <algorithm>
#include <stack>
#include <fstream>
using namespace std;
typedef long long ll;
void to_binary(int x) {
    string r = "";
    while(x) {
        r += (x % 2) + '0';
        x /= 2;
    }
    reverse(r.begin(), r.end());
    cout << r << endl;
}
int main() {
    int number = 21;
    to_binary(number);
    number |= (1 << 1);
    cout << number << endl;
    to_binary(number);

    number |= (1 << 3);
    to_binary(number);

    cout << number << endl;
    return 0;
}