#define UNUSED(x) (void)(x)

extern "C" int main(int argc, char *argv[], char *envp[])
{
    UNUSED(argc);
    UNUSED(argv);
    UNUSED(envp);

    unsigned long ret;
    asm volatile("syscall"
                 : "=a"(ret)
                 : "a"(1), "D"(1)
                 : "rcx", "r11", "memory");
    return ret;
}