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#include<bits/stdc++.h>
#define DilligentArch() ios_base::sync_with_stdio(false); cin.tie(0),cout.tie(0);
#define testcase(t) int t; cin>>t; while(t--)
#define pb push_back
typedef long long ll;
using namespace std;
const int N = 1e5+10;
vector<int>g[N];
bool cat[N];
ll ct=0;
ll n,m;
char arr[N][N];


void dfs(ll i, ll j) {
    if(i<0 or j<0) return;
    if(i>=n or j>=m) return;
    if(arr[i][j]!= '.' or arr[i][j]!='@')return;
    ct++;
    dfs(i-1,j);
    dfs(i+1,j);
    dfs(i,j-1);
    dfs(i,j+1);
}



void solve()
{
    cin>>n>>m;
    ll x,y;
    for(ll i=0; i<n; i++) {
        for(ll j=0; j<m; j++) {
            cin>>arr[i][j];
            if(arr[i][j]=='@') {
                x=i;
                y=j;
            }

        }
    }
    arr[x][y]='.';
    dfs(x,y);

    cout<<ct<<endl;

    }

    int main()

    {

        DilligentArch()

        // testcase(t){

        solve();

   }     //}