#include<bits/stdc++.h>
using namespace std;
int n,m,ans;
char a[21][21];
void dfs(int x,int y){
    ans++;
    if(a[x+1][y]=='.') a[x+1][y]='#',dfs(x+1,y);
    if(a[x][y+1]=='.') a[x][y+1]='#',dfs(x,y+1);
    if(a[x-1][y]=='.') a[x-1][y]='#',dfs(x-1,y);
    if(a[x][y-1]=='.') a[x][y-1]='#',dfs(x,y-1);
}
int main(){
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            cin>>a[i][j];
        }
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            if(a[i][j]=='@') dfs(i,j);
        }
    }
    cout<<ans;
    return 0;
}
 
/**************************************************************
	Problem: 1897
	User: jzh
	Language: C++
	Result: Wrong Answer
****************************************************************/