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Description has only two Sentences

Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 190    Accepted Submission(s): 8


Problem Description
an = X*an-1 + Y and Y mod (X-1) = 0.
Your task is to calculate the smallest positive integer k that ak mod a0 = 0.
 

Input
Each line will contain only three integers X, Y, a0 ( 1 < X < 231, 0 <= Y < 263, 0 < a0 < 231).
 

Output
For each case, output the answer in one line, if there is no such k, output "Impossible!".
 

Sample Input
2 0 9
 

Sample Output
1
 

Author
WhereIsHeroFrom
 

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