#include <stdio.h>

int main() {
    int matrix[10][10];
    int n, mainDiagonalSum = 0, secondaryDiagonalSum = 0;

    // Input the size of the square matrix
    printf("Enter the size of the square matrix (n x n): ");
    scanf("%d", &n);

    // Input matrix elements
    printf("Enter the elements of the matrix:\n");
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            scanf("%d", &matrix[i][j]);
        }
    }

    // Calculate diagonal sums
    for (int i = 0; i < n; i++) {
        mainDiagonalSum += matrix[i][i];                   // main diagonal
        secondaryDiagonalSum += matrix[i][n - 1 - i];      // secondary diagonal
    }

    // If matrix is odd-sized, subtract middle element once (counted twice)
    if (n % 2 == 1) {
        int middle = matrix[n / 2][n / 2];
        printf("Middle element (counted twice): %d\n", middle);
        printf("Sum of diagonals: %d\n", mainDiagonalSum + secondaryDiagonalSum - middle);
    } else {
        printf("Sum of main diagonal: %d\n", mainDiagonalSum);
        printf("Sum of secondary diagonal: %d\n", secondaryDiagonalSum);
        printf("Total sum of diagonals: %d\n", mainDiagonalSum + secondaryDiagonalSum);
    }

    return 0;
}