#include<bits/stdc++.h>
using namespace std;
int n,m,ans=1,ii,jj;
char x[111][111];
int fx[4]={-1,0,1,0};
int fy[4]={0,-1,0,1};

void dfs(int xx,int y){
	
for(int i=0;i<4;i++){
	int tx=xx+fx[i];
	int ty=y+fy[i];

	if(tx>=1&&tx<=n&&ty>=1&&ty<=m&&x[tx][ty]=='.'){

	x[tx][ty]='#';
	ans++;
	dfs(tx,ty);
}
	
} 
}
int main(){
cin>>m>>n;
for(int i=1;i<=n;i++){
	for(int j=1;j<=m;j++){
	cin>>x[i][j];
	if(x[i][j]=='@'){
		ii=i;
		jj=j;
	}
}
}
dfs(ii,jj);


cout<<ans;
	return 0;
}

/**************************************************************
	Problem: 1897
	User: chenyubo
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2084 kb
****************************************************************/