#include <iostream>
#include <cmath>
using namespace std;
 
// zdefiniuj funkcjÄ™
string na2(int liczba) {
       if (liczba == 0)
       return "0";
       string pom = "";
       while (liczba > 0) {
             pom = char(liczba % 2 + 48) + pom;
             liczba = liczba / 2;
 
}
return pom;
}
int main() {
    cout<< na2(42)<< endl;
    cout<< na2(53)<< endl;
 
    return 0;
}
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