case of n = 1 handled separately
if ( n == 1 ) Console . WriteLine ( - 1 ) ; else { b = ( n * n - 1 ) / 2 ; c = ( n * n + 1 ) / 2 ; Console . WriteLine ( " Side ▁ b ▁ = ▁ " + b + " , ▁ Side ▁ c ▁ = ▁ " + c ) ; } } else {