Competitions

# ADA University - February 9

# 23 out of 5

Is it possible to find an arithmetic expression consisting of five given numbers that will yield the value **23**. For this problem you can use only three arithmetic expressions: **+**, **-**, *****. Assume that all these operations have the same priority and executed sequentially from left to right.

#### Input

Each line contains five positive integers from **1** to **50**. Input is terminated by a line containing five zero's and is not processed.

#### Output

For each test case print "**Possible**" (without quotes) if their exists an arithmetic expression as described above that yields **23**. Otherwise print "**Impossible**".

Input example #1

1 1 1 1 1 1 2 3 4 5 2 3 5 7 11 0 0 0 0 0

Output example #1

Impossible Possible Possible