#include<iostream>
using namespace std;
const int N=51;
int n,m,ans,x1,y1;
char a[N][N];
void dfs(int x,int y)
{
if(x>n||x<=0||y>m||y<=0)return;
if(a[x][y]=='#')
{
return ;
}
ans++;
a[x][y]='#';
dfs(x+1,y);
dfs(x-1,y);
dfs(x,y+1);
dfs(x,y-1);
}
int main()
{
cin>>m>>n;
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
cin>>a[i][j];
if(a[i][j]=='@')
{
x1=i;
y1=j;
}
}
}
dfs(x1,y1);
cout<<ans;
return 0;
}