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Вступ_Заоч-3

Greatest divisor

For a given positive integer n print its greatest divisor other than n.

Input

One positive integer n (1 < n < 2147000000).

Output

Print the greatest divisor of n other than n.

Time limit 1 second
Memory limit 128 MiB
Input example #1
21
Output example #1
7
Author Matviychuk Sergiy Volodymyrovych
Source "ABC programming"