Number puzzle magic square

It is a puzzle making length, the side, the diagonal total the same. As there is not the time limit, please play slowly. Please come to time killing. I prepared for 3*3 size, 5*5 size. If there is the hint that a number is fixed to from a beginning in 5*5 size, there is free to solve all by oneself. 5*5 size is said to be approximately 300 million ways in total. As you are free, please enjoy it.