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Time limit 2000/4000/4000/4000 ms. Memory limit 65000/65000/65000/65000 Kb.
Difficulty Beta
Your task is to calculate the number of trailing zeros in the factorial n!.
For example, 20!=2432902008176640000 and it has 4 trailing zeros.
Input
The only input line has an integer n.
Output
Print the number of trailing zeros in n!.
Constraints
1≤n≤10^9
Example
Input:
20
Output:
4
Для отправки решений необходимо выполнить вход.
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