#include "cstdio"

#include "queue"

#include "string"

#include "cstring"

#include "iostream"

using namespace std;

int n,m,sx,sy,map[][],dir[][]={-,,,,,-,,},cnt;

bool vis[][];

struct status

{

    int x,y;

    status(int x,int y):x(x),y(y) {}

};

void bfs(int x,int y)

{

    queue<status> Q;

    Q.push(status(sx,sy));

    vis[sx][sy]=true;

    while(!Q.empty())

    {

        cnt++;

        status t=Q.front();Q.pop();

        for(int s=;s<;s++)

        {

            int X=t.x+dir[s][],Y=t.y+dir[s][];

            if(vis[X][Y]||X<||X>n||Y<||Y>m||!map[X][Y]) continue;

            vis[X][Y]=true;

            Q.push(status(X,Y));

        }

    }

}

int main()

{

    //freopen("in.txt","r",stdin);

    ios::sync_with_stdio(false);

    string tt;

    while(cin>>m>>n&&n)

    {

        cnt=;

        memset(vis,,sizeof(vis));

        for(int i=;i<=n;i++)

        {

            cin>>tt;

            for(int j=;j<tt.size();j++)

            {

                if(tt[j]=='#') map[i][j+]=;

                if(tt[j]=='.') map[i][j+]=;

                if(tt[j]=='@') {map[i][j+]=;sx=i;sy=j+;}

            }

        }

        bfs(sx,sy);

        cout<<cnt<<endl;

    }

}