Perfect Subarrays

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You are given an array A, which consists of N integers. Also, you have an integer K.
Let's call a subarray A[L..R] perfect, if the average of the numbers A_{L}, A_{L + 1}, ..., A_{R  1}, A_{R} is greater than or equal to K.
I.e. the average of the numbers {2, 5, 9, 3} equals to 3.25.
So, your task is quite simple: you are to count the number of perfect subarrays of A.
Input
The first line contains two integers N and K.
The second line contains N integers, i'th integer denotes A_{i}. The array A is 1indexed.
Output
The first line should contain an integer, denoting the number of perfect subarrays of A.
Example
Input: 4 2 1 2 3 1 Output: 4
Explanation
In the test case N equals to 4, K equals to 2, A equals to {1, 2, 3, 1}. The following subarrays are perfect: [2..2], [3..3], [2..3], [1..3].
Scoring
10^{9} ≤ K ≤ 10^{9} for each test case;
10^{9} ≤ A_{i} ≤ 10^{9} for each test case;
Subtask 1 (10 points): 1 ≤ N ≤ 100;
Subtask 2 (39 points): 1 ≤ N ≤ 6000;
Subtask 3 (11 points): 1 ≤ N ≤ 150 000, K = 0;
Subtask 4 (20 points): 1 ≤ N ≤ 150 000;
Subtask 5 (20 points): 1 ≤ N ≤ 1 000 000;
Author:  kostya_by 
Editorial  http://discuss.codechef.com/problems/SUBARR 
Tags  bit, easy, fenwick, kostya_by, ltime07, prefixsum, segmenttree 
Date Added:  27112013 
Time Limit:  1 sec 
Source Limit:  50000 Bytes 
Languages:  C, CPP14, JAVA, PYTH, PYTH 3.6, CS2, PAS fpc, PAS gpc, RUBY, PHP, GO, NODEJS, HASK, SCALA, D, PERL, FORT, WSPC, ADA, CAML, ICK, BF, ASM, CLPS, PRLG, ICON, SCM qobi, PIKE, ST, NICE, LUA, BASH, NEM, LISP sbcl, LISP clisp, SCM guile, JS, ERL, TCL, PERL6, TEXT, PYP3, CLOJ, FS 
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