#include <iostream>
using namespace std;
bool test()
{
return false;
}
int main() {
static bool bDown = false;
if(test())
{
bDown = true;
}
else if(bDown)
{
bDown = false;
}
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKCmJvb2wgdGVzdCgpCnsKICAgIHJldHVybiBmYWxzZTsKfQoKaW50IG1haW4oKSB7CnN0YXRpYyBib29sIGJEb3duID0gZmFsc2U7CgogICAgaWYodGVzdCgpKQogICAgewogICAgICAgIGJEb3duID0gdHJ1ZTsKICAgIH0KICAgIGVsc2UgaWYoYkRvd24pCiAgICB7CiAgICAgICAgYkRvd24gPSBmYWxzZTsKICAgIH0KCXJldHVybiAwOwp9