Which expression for YYY outputs "Quarter century!" when the input is $25?$

int x; cin $>>$ x;

if $($YYY$)\{$

cout $<$ "Nothing special";

$$

else $\{$

$$

cout $$ "Quarter century!";

X$=$

$25$

$$ x$<>25$

$$ x$!=25$

$$ x$==125$