#include <stdio.h>

int main(){
	int matrix [3][3] = { { 1,2,3}, {6,7,8} , { 11,12,13} };
	int i, j;
	int sum=0;
	for (i = 0; i < 3; i++) 
	{ 
		for (j = 0; j < 3; j++) 
		{
			if(i==j){
				sum+=matrix[i][j];
		    }
		}
	    //printf("\n");
	}
	printf("Value of Diagonal: %d",sum);
}