1290 : 2^x mod n = 1

Give a number n, find the minimum x(x>0) that satisfies 2^x mod n = 1. 

One positive integer on each line, the value of n. 

If the minimum x exists, print a line with 2^x mod n = 1. 



Print 2^? mod n = 1 otherwise. 



You should replace x and n with specific numbers. 

2
5

2^? mod 2 = 1
2^4 mod 5 = 1