#include <bits/stdc++.h> using namespace std; int w = 1,h = 1,a,b,sun = 0; char z[25][25];

void afd(int x,int y){ sun++; z[x][y] = '/';

if(z[x+1][y] == '.'){
	afd(x+1,y);
}
if(z[x-1][y] == '.'){
	afd(x-1,y);
}
if(z[x][y+1] == '.'){
	afd(x,y+1);	
}
if(z[x][y-1] == '.'){
	afd(x,y-1);

}

}

int main(){ while(cin >> h >> w&&(w!=0||h!=0)){ sun = 0; for(int i = 1;i<=20;i++){ for(int j = 1;j<=20;j++){ z[i][j] = ' '; } } for(int i = 1;i<=w;i++){ for(int j = 1;j<=h;j++){ cin >> z[i][j]; if(z[i][j] == '@'){ a = i; b = j;

			}

		}
	}
	afd(a,b);	
	cout << sun << endl;	
}

}