#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];
    int dx[]={1,-1,0,0},dy[]={0,0,1,-1};
    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});
    while(!q.empty()){
        int sz=q.size();
        vector<pair<int,int>> nxt;
        for(int t=0;t<sz;t++){
            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 c=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]=='#') c++;
                }
                if(c==1) nxt.push_back({ni,nj});
            }
        }
        if(nxt.empty()) break;
        for(auto [i,j]:nxt) S[i][j]='#', q.push({i,j});
    }
    int ans=0; for(auto &r:S) for(char c:r) ans+=c=='#';
    cout<<ans;
}

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MTAgMTAKLi4uLi4uLi4uLgouLi4uIy4uLi4uCiMuLi4uLi4uIy4KLi4uLi4uIy4uLgouLi4uLi4uIy4uCi4uLi4uIy4uLi4KLi4uLi4uLi4uLgouLi4uLi4uLi4uCi4uIy4uLiMuLi4KLi4uLi4uLiMuLgo=

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