Problem #PRU-66389

Problem

A square $4\times 4$ is called magic if all the numbers from 1 to 16 can be written into its cells in such a way that the sums of numbers in columns, rows and two diagonals are equal to each other. Sixth-grader Edwin began to make a magic square and written the number 1 in certain cell. His younger brother Theo decided to help him and put the numbers $2$ and $3$ in the cells adjacent to the number $1$. Is it possible for Edwin to finish the magic square after such help?