Виток 1, Шаг 8 - Битовые операции
Set a bit
Two integers a and k are given. Print the number that is obtained from а by setting the value of k-th bit to 1.
One line contains two integers a and k (0 ≤ a ≤
109). The least significant bit of a is a bit number zero.
Print the number a with a set k-th bit.