N is Fibinacci if one of 5 * n * n + 4 or 5 * n * n - 4 or both are perferct square
if ( isPerfectSquare ( 5 * n * n + 4 ) or isPerfectSquare ( 5 * n * n - 4 ) ) : NEW_LINE INDENT return 1 ; NEW_LINE DEDENT return 0 ; NEW_LINE