#include <iostream>

using namespace std;

int main()
{
    int n,m;
    cin>>n>>m;
    char mat[n][m];
    int a1=-1,b1=-1,a2=-1,b2=-1, aPom=0, bPom=0;
    int x1=-1,y1=-1,x2=-1,y2=-1, xPom=0, yPom=0;
    for(int i=0;i<n;i++)
        for(int j=0;j<m;j++)
        {
            cin>>mat[i][j];
            if(mat[i][j]=='.'){
                    if(a1 != -1)
                        aPom = 1;
                    if(b2 != -1 && b2 == j)bPom = 1;
            }
            if(mat[i][j] == '#')
            {
                if(a1==-1){
                    a1=i;b1=j;
                }else if(i == a1 && aPom == 0)b2 = j;
                if(b2 != -1 && bPom == 0 && b2==j) a2=i;
            }
        }
    for(int i = 0; i<n;i++)
    {
        for(int j = 0; j<m;j++)
        {
            if(mat[i][j] == '#' && !(((a1==i || a2 == i) && j>=b1 && j <= b2) || ((b1 ==j || b2 ==j) && i>=a1 &&i<=a2)))
            {
                x1 = i;y1=j;
                while(mat[i][j]=='#' && j<m)j++;
                j--;
                y2=j;
                while(mat[i][j]=='#' && i < n)i++;
                i--;
                x2=i;
                break;
            }
        }
        if(x1 != -1)break;
    }
    cout << (a2-a1+1)*(b2-b1+1) + (x2-x1+1)*(y2-y1+1) << endl;
    return 0;
}