Subarray Sum Calculation

Given an array of integers and two indices l and r (0-indexed), compute the sum of the subarray from index l to r (both inclusive).

The input consists of an integer n (number of elements), a dummy parameter x (unused, provided for possible future extensions), followed by n integers representing the array, then two integers l and r. The answer is the sum of elements from index l to r.

The mathematical formulation is given by:

\( S = \sum_{i=l}^{r} a_i \)

inputFormat

The first line contains two integers n and x.

The second line contains n space-separated integers denoting the array elements.

The third line contains two integers l and r, the starting and ending indices of the subarray (0-indexed).

outputFormat

Output a single integer, the sum of the elements from index l to r of the array.

## sample

7 2
2 4 6 8 10 12 14
1 3

18

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