For two integers m and k, k is said to be a container of m if k is divisible by m. Given 2 positive integers n and m (m < n), the function f(n, m) is defined to be the number of containers of m which are also no greater than n. For example, f(5, 1)=4, f(8, 2)=3, f(7, 3)=1, f(5, 4)=0...
Let us define another function F(n) by the following equation:
Now given a positive integer n, you are supposed to calculate the value of F(n).
2 1 4
0 4
无
ZOJ 3175 Number of Containers