/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
class Ideone
{
	public static Scanner sc = new Scanner(System.in);
 
	public static void main (String[] args) throws java.lang.Exception
	{
		int n = sc.nextInt();
		if( n >= 1 && n <= 100){
			int sum = 0;
			for(int i = 0; i < n; i++){
				for(int j = 0; j < n; j++){
					sum += sc.nextInt();
				}
			}
			System.out.println(String.format("%d", sum));
		}
 
	}
}

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

MwoxIDAgMQoxIDEgMAowIDEgMQ==

3
1 0 1
1 1 0
0 1 1