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Problem
Read two integers `n` and `k`, then `n` integers forming a sequence
`v[1], v[2], ..., v[n]`. Count how many contiguous subarrays
`v[i], v[i+1], ..., v[j]` have a sum equal to `k`.
Input format
Input
input.txt
The first line contains two integers `n` and `k` separated by a space. The second line contains `n` integers separated by spaces. - `1 <= n <= 1000` - `-10^6 <= k <= 10^6` - `-1000 <= v[i] <= 1000` - each subarray must contain at least one element
Output format
Output
output.txt
Print a single natural number: the count of contiguous subarrays whose sum equals `k`, followed by a newline.
Example
input
5 7 1 2 3 4 5
output
1
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Sample cases (from the problem)
Sample Case 1
Input
5 7 1 2 3 4 5
Expected output
1
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