计算最大质因数的一个算法的问题,怎么利用C语言的程序设计的思路来解决

Problem Description
Everybody knows any number can be combined by the prime number.
Now, your task is telling me what position of the largest prime factor.
The position of prime 2 is 1, prime 3 is 2, and prime 5 is 3, etc.
Specially, LPF(1) = 0.

Input
Each line will contain one integer n(0 < n < 1000000).

Output
Output the LPF(n).

Sample Input
1
2
3
4
5

Sample Output
0
1
2
1
3

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