How to find the sum of each element in Two dimensional array

import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner input=new Scanner(System.in);
        int n=input.nextInt();
        int m=input.nextInt();
        int a[][]=new int [n][m];
        for(int i=0;i<n;i++){
            for(int j=0;j<m;j++){
                a[i][j]=input.nextInt();            
        }
    }
    int sum=0;
    for(int i=0;i<n;i++){
        for(int j=0;j<m;j++){
            sum=sum+a[i][j];
        }
           
    }
 System.out.println(sum);
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    }
}