Partial Sums

Time Limit: 2 Seconds
Memory Limit: 65536 KB

Given a series of n numbers a1, a2, ..., an, the partial sum of the numbers
is defined as the sum of ai, ai+1, ..., aj.

You are supposed to calculate how many partial sums of a given series of numbers
could be divided evenly by a given number m.

**Input**

There are multiple test, each contains 2 lines.

The first line is 2 positive integers n (n <= 10000 ) and m (m <= 5000).

The second line contains n non-negative integers a1, a2, ..., an. Numbers are
separated by one or several spaces.

The input is ended by EOF.

**Output**

One test each line - the number of partial sums which could be divided by m.

**Sample Input**

5 4

1 2 3 4 5

6 7

9 8 7 6 5 4

**Sample Output**

2

3

Author:

**TANG, Jiqing**
Source:

**ZOJ Monthly, March 2003**
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