import java.util.Scanner;

public class Navigation {
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);

        int rows = Integer.parseInt(scanner.nextLine());
        int cols = Integer.parseInt(scanner.nextLine());

        int maxMoves = Integer.parseInt(scanner.nextLine());
        String[] codes = scanner.nextLine().split(" ");

        int[][] matrix = new int[rows][cols];
        int currentPowerOfTwo = 1;
        for(int row = rows - 1; row >= 0; row--){
            for(int col = 0; col < cols; col++){
                matrix[row][col] = currentPowerOfTwo;
                currentPowerOfTwo *= 2;
            }
            currentPowerOfTwo = matrix[row][0] * 2;
        }

        int coef = Math.max(rows, cols);

        int currentRow = rows - 1;
        int currentCol = 0;

        int sum = 1;
        for(int i = 0; i < codes.length; i++){
            int code = Integer.parseInt(codes[i]);

            int colPurpose = code % coef;
            int rowPurpose = code / coef;

            if(currentCol < colPurpose && colPurpose < cols){
                // horizontal sum
                for (int col = currentCol + 1; col <= colPurpose; col++) {
                    sum += matrix[currentRow][col];
                }
                currentCol = colPurpose;

                if(currentRow > rowPurpose && rowPurpose >= 0){
                    // vertical sum
                    for(int row = currentRow - 1; row >= rowPurpose; row--){
                        sum += matrix[row][currentCol];
                    }
                    currentRow = rowPurpose;
                }else if (currentRow < rowPurpose && rowPurpose < rows){
                    // vertical sum
                    for(int row = currentRow + 1; row <= rowPurpose; row++){
                        sum += matrix[row][currentCol];
                    }
                    currentRow = rowPurpose;
                }
            }else if (currentCol > colPurpose && colPurpose >= 0){
                // horizontal sum
                for (int col = currentCol - 1; col >= colPurpose; col--) {
                    sum += matrix[currentRow][col];
                }
                currentCol = colPurpose;

                if(currentRow > rowPurpose && rowPurpose >= 0){
                    // vertical sum
                    for(int row = currentRow - 1; row >= rowPurpose; row--){
                        sum += matrix[row][currentCol];
                    }
                    currentRow = rowPurpose;
                }else if (currentRow < rowPurpose && rowPurpose < rows){
                    // vertical sum
                    for(int row = currentRow + 1; row <= rowPurpose; row++){
                        sum += matrix[row][currentCol];
                    }
                    currentRow = rowPurpose;
                }
            }




//            System.out.println(rowPurpose + " " + colPurpose);
        }

        System.out.print(sum);

/*        for(int row = 0; row < rows; row++){
            for(int col = 0; col < cols; col++){
                System.out.print(matrix[row][col] + "  ");
            }
            System.out.println();
        }
*/


    }
}