Sum of elements in a matrix
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Given a non null integer matrix Grid of dimensions NxM.Calculate the sum of its elements.

Example 1:

Input:
N=2,M=3
Grid=
[[1,0,1],
[-8,9,-2]]
Output:
1
Explanation:
The sum of all elements of the matrix is
(1+0+1-8+9-2)=1.

Example 2:

Input:
N=3,M=5
Grid=
[[1,0,1,0,1],
[0,1,0,1,0],
[-1,-1,-1,-1,-1]]
Output:
0
Explanation:
The sum of all elements of the matrix are
(1+0+1+0+1+0+1+0+1+0-1-1-1-1-1)=0.

You don't need to read input or print anything.Your task is to complete the function sumOfMatrix() which takes two integers N ,M and a 2D array Grid as input parameters and returns the sum of all the elements of the Grid.

Expected Time Complexity:O(N*M)
Expected Auxillary Space:O(1)

Constraints:
1<=N,M<=1000
-1000<=Grid[i][j]<=1000

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