Problem Statement

You are given a sequence of positive integers of length N, A=a_1,a_2,…,a_{N}, and an integer K.
How many contiguous subsequences of A satisfy the following condition?

• (Condition) The sum of the elements in the contiguous subsequence is at least K.

We consider two contiguous subsequences different if they derive from different positions in A, even if they are the same in content.
Note that the answer may not fit into a 32-bit integer type.

Input

Input is given from Standard Input in the following format:
N K
a_1 a_2 ... a_N

Output

Print the number of contiguous subsequences of A that satisfy the condition.

Constraints

• $1 \leq a_i \leq 10^5$
• $1 \leq N \leq 10^5$
• $1 \leq K \leq 10^{10}$

Sample Input 1

4 10
6 1 2 7

Sample Output 1

2

The following two contiguous subsequences satisfy the condition:

• A[1..4]=a_1,a_2,a_3,a_4, with the sum of 16
• A[2..4]=a_2,a_3,a_4, with the sum of 10

Sample Input 2

3 5
3 3 3

Sample Output 2

3

Note again that we consider two contiguous subsequences different if they derive from different positions, even if they are the same in content.

Sample Input 3

10 53462
103 35322 232 342 21099 90000 18843 9010 35221 19352

Sample Output 3

36

见题面 Input 部分

见题面 Output 部分