#include<iostream> #include<vector> #include<string> using namespace std; int W,H,ans=1; vector<vector <string> > A; bool vit[20][20]; void dfs(int x,int y){

if(y+1<W&&A[x][y+1]=="."&&!vit[x][y+1])
{
	ans++;
	vit[x][y+1]=1;
	dfs(x,y+1);
}
if(x+1<H&&A[x+1][y]!="#"&&!vit[x+1][y])
{
	ans++;
	vit[x+1][y]=1;
	dfs(x+1,y);
}
if(y-1>=0&&A[x][y-1]!="#"&&!vit[x][y-1])
{
	ans++;
	vit[x][y-1]=1;
	dfs(x,y-1);
}
if(x-1>=0&&A[x-1][y]=="."&&!vit[x-1][y])
{
	ans++;
	vit[x-1][y]=1;
	dfs(x-1,y);
}

// return; } int main(){ char ch; int x,y; cin>>W>>H; vector<vector <string> > B(H,vector<string> (W)); for(int i=0;i<H;i++) { for(int j=0;j<W;j++) { cin>>ch; B[i][j]=ch; if(B[i][j]=="@") { x=i;y=j; vit[i][j]=1; } } } A=B; dfs(x,y); cout<<ans<<endl; return 0; }