#include <iostream>
#include <sstream>
int main() {
std::istringstream iss("5C3");
double n;
iss >> n;
std::cout << n << std::endl;
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8c3N0cmVhbT4KCmludCBtYWluKCkgewoJc3RkOjppc3RyaW5nc3RyZWFtIGlzcygiNUMzIik7CgkKCWRvdWJsZSBuOwoJaXNzID4+IG47CgkKCXN0ZDo6Y291dCA8PCBuIDw8IHN0ZDo6ZW5kbDsKCQoJcmV0dXJuIDA7Cn0=