#include<bits/stdc++.h>

#define ll long long

#define un unsigned

#define int long long

#define db double

#define st string

#define ct const

#define xh(a,b,c) for(int a=b;a<=c;a++)

#define wx while(1)

#define dn(a,b,c) for(int a=b;a>=c;a--)

using namespace std;

int n,m;

char a[1010][1010];

int tx[]={1,-1,0,0};

int ty[]={0,0,1,-1};

bool f[1010][1010];

int ans,maxn;

void dfs(int x,int y){

f[x][y]=1;

++ans;

xh(i,0,3){

int X=x+tx[i],Y=y+ty[i];

if(a[X][Y]=='*'&&!f[X][Y])dfs(X,Y);

}

}

signed main(){

cin>>m>>n;

xh(i,1,n)xh(j,1,m)cin>>a[i][j];

xh(i,1,n)xh(j,1,m)if(a[i][j]=='*'&&!f[i][j]){

ans=0;

dfs(i,j);

maxn=max(maxn,ans);

}

cout<<maxn;

return 0;

} ~~~~