#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
using namespace std;

int main() {
	bool I = true , J = true;
	int n, m, ans = 0, black = 0, white = 0, ans1 = 0;
	string s;
	cin >> n >> m;
	int choco[50][50];
	for (int i = 0; i < n; i++) {
		cin >> s;
		for (int j = 0; j < s.size(); j++) {
			if (s[j] == '.')choco[i][j] = 0;
			else if (s[j] == 'w') {
				choco[i][j] = 1;
				white++;
			}
			else if (s[j] == 'b') {
				choco[i][j] = 2;
				black++;
			}
		}
	}
	int blackT = black, whiteT = white;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			if (i + 1 >= n)I = false; else I = true;
			if (j + 1 >= n)J = false; else J = true;
			if (choco[i][j] + choco[i][j + 1] == 3 && J) {
				choco[i][j] = 0; choco[i][j + 1] = 0;
				ans += 100; black--; white--;
			}
			else if(choco[i][j] + choco[i + 1][j] == 3 && I) {
				choco[i][j] = 0; choco[i + 1][j] = 0;
				ans += 100; black--; white--;
			}
		}
	}
	ans += min(black, white) * 10;
	ans += (max(black, white) - min(black, white));
	black = blackT; white = whiteT;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			if (i + 1 >= n)I = false; else I = true;
			if (j + 1 >= n)J = false; else J = true;
			if (choco[i][j] + choco[i + 1][j] == 3 && I) {
				choco[i][j] = 0; choco[i + 1][j] = 0;
				ans1 += 100; black--; white--;
			}
			else if (choco[i][j] + choco[i][j + 1] == 3 && J) {
				choco[i][j] = 0; choco[i][j + 1] = 0;
				ans1 += 100; black--; white--;
			}
			
		}
	}
	ans1 += min(black, white) * 10;
	ans1 += (max(black, white) - min(black, white));
	cout << max(ans, ans1) << endl;
	return 0;
}