import java.util.*;

public class Main {
 	public static void main (String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int h = sc.nextInt();
		int w = sc.nextInt();
		char[][] field = new char[h + 2][];
		int bCount = 0;
		int wCount = 0;
		for (int i = 0; i <= h + 1; i++) {
		    if (i == 0 || i == h + 1) {
		        field[i] = new char[w + 2];
		        Arrays.fill(field[i], '.');
		        continue;
		    }
		    field[i] = ("." + sc.next() + ".").toCharArray();
		    for (int j = 1; j <= w; j++) {
		        if (field[i][j] == 'w') {
		            wCount++;
		        } else if (field[i][j] == 'b') {
		            bCount++;
		        }
		    }
		}
		int[][] counts = new int[h + 2][w + 2];
		for (int i = 1; i <= h; i++) {
		    for (int j = 1; j <= w; j++) {
		        if (field[i][j] != '.') {
		            if (field[i - 1][j] != '.') {
		                counts[i][j]++;
		            }
		            if (field[i + 1][j] != '.') {
		                counts[i][j]++;
		            }
		            if (field[i][j - 1] != '.') {
		                counts[i][j]++;
		            }
		            if (field[i][j + 1] != '.') {
		                counts[i][j]++;
		            }
		        }
		    }
		}
		boolean flag = true;
		int point = 0;
		while (flag) {
		    flag = false;
		    for (int i = 1; i <= h; i++) {
		        for (int j = 1; j <= w; j++) {
		            if (counts[i][j] == 1) {
		                if (counts[i - 1][j] > 0) {
		                    counts[i - 1][j] = 0;
		                    counts[i][j] = 0;
		                    counts[i - 2][j]--;
		                    counts[i - 1][j - 1]--;
		                    counts[i - 1][j + 1]--;
		                    wCount--;
		                    bCount--;
		                    flag = true;
		                    point += 100;
		                    break;
		                }
		                if (counts[i + 1][j] > 0) {
		                    counts[i][j] = 0;
		                    counts[i + 1][j] = 0;
		                    counts[i + 2][j]--;
		                    counts[i + 1][j - 1]--;
		                    counts[i + 1][j + 1]--;
		                    wCount--;
		                    bCount--;
		                    flag = true;
		                    point += 100;
		                    break;
		                }
		                if (counts[i][j - 1] > 0) {
		                    counts[i][j] = 0;
		                    counts[i][j - 1] = 0;
		                    counts[i][j - 2]--;
		                    counts[i - 1][j - 1]--;
		                    counts[i + 1][j - 1]--;
		                    wCount--;
		                    bCount--;
		                    flag = true;
		                    point += 100;
		                    break;
		                }
		                if (counts[i][j + 1] > 0) {
		                    counts[i][j] = 0;
		                    counts[i][j + 1] = 0;
		                    counts[i][j + 2]--;
		                    counts[i - 1][j + 1]--;
		                    counts[i + 1][j + 1]--;
		                    wCount--;
		                    bCount--;
		                    flag = true;
		                    point += 100;
		                    break;
		                }
		            }
		        }
		    }
		}
		int allCount = 0;
		for (int i = 1; i <= h; i++) {
		    for (int j = 1; j <= w; j++) {
		        if (counts[i][j] > 0) {
		            allCount++;
		        }
		    }
		}
		point += allCount / 2 * 100;
		bCount -= allCount / 2;
		wCount -= allCount / 2;
		int max = Math.max(wCount, bCount);
		int min = Math.min(wCount, bCount);
		point += 10 * min;
		point += max - min;
		System.out.println(point);
	}
}