#include <iostream>
#include <bitset>
using namespace std;
int main() {
std::bitset<8> bits("1111");
std::cout << bits.to_ulong() << std::endl;
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8Yml0c2V0Pgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKSB7CglzdGQ6OmJpdHNldDw4PiBiaXRzKCIxMTExIik7CglzdGQ6OmNvdXQgPDwgYml0cy50b191bG9uZygpIDw8IHN0ZDo6ZW5kbDsKCXJldHVybiAwOwp9