#include <bits/stdc++.h>
using namespace std;
int main(){
    int H,W; cin>>H>>W;
    vector<string> S(H);
    for(int i=0;i<H;i++) cin>>S[i];
    queue<pair<int,int>> q;
    for(int i=0;i<H;i++)
        for(int j=0;j<W;j++)
            if(S[i][j]=='#') q.push({i,j});
    int dx[]={1,-1,0,0}, dy[]={0,0,1,-1};
    while(!q.empty()){
        auto [i,j]=q.front(); q.pop();
        for(int k=0;k<4;k++){
            int ni=i+dx[k], nj=j+dy[k];
            if(ni<0||ni>=H||nj<0||nj>=W||S[ni][nj]=='#') continue;
            int cnt=0;
            for(int l=0;l<4;l++){
                int ti=ni+dx[l], tj=nj+dy[l];
                if(ti>=0&&ti<H&&tj>=0&&tj<W&&S[ti][tj]=='#') cnt++;
            }
            if(cnt==1){
                S[ni][nj]='#';
                q.push({ni,nj});
            }
        }
    }
    int ans=0;
    for(auto &row:S) for(char c:row) ans+=c=='#';
    cout<<ans;
}

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MTAgMTAKLi4uLi4uLi4uLgouLi4uIy4uLi4uCiMuLi4uLi4uIy4KLi4uLi4uIy4uLgouLi4uLi4uIy4uCi4uLi4uIy4uLi4KLi4uLi4uLi4uLgouLi4uLi4uLi4uCi4uIy4uLiMuLi4KLi4uLi4uLiMuLgo=

10 10
..........
....#.....
#.......#.
......#...
.......#..
.....#....
..........
..........
..#...#...
.......#..