#include<bits/stdc++.h>
using namespace std;
#define int long long
//#define mod 1000000007
#define N 3002
#define pii pair<int,int>
#define fi first
#define se second
//#define rep(i,j,k) for(int i=j;i<=k;i++)
int n,m;
char s[N][N];
bool t[N][N],t2[N][N];
int tot=0;
int c=0;
namespace subqwq{
	int ss[N*2],lm[N*2],rm[N*2],tl,tr,tt;
	int ans;
	void work(){
		int op=1;
		for(int x=1,y=1;x!=n||y!=m;){
			if(t2[x+1][y])lm[++tl]=(x*m+y),x++;
			else lm[++tl]=((x-1)*m+y+1),y++;
		}
		for(int x=1,y=1;x!=n||y!=m;){
			if(t2[x][y+1])rm[++tr]=((x-1)*m+y+1),y++;
			else rm[++tr]=(x*m+y),x++;
		}
		// for(int i=1;i<=tl;i++)cout<<lm[i]<<' ';cout<<endl;
		// for(int i=1;i<=tl;i++)cout<<rm[i]<<' ';cout<<endl;
		for(int i=1;i<=tl;i++){
			if(rm[i]==lm[i]){op++;continue;}
			int x=(lm[i]-1)/m+1,y=(lm[i]-1)%m+1;
			// cout<<x<<' '<<y<<endl;
			x--,y++;
			while(!(t2[x][y]&&t[x][y]))x--,y++;
			// cout<<x<<' '<<y<<endl;
			int u=x,v=y;
			for(;u!=1||v!=1;){
				ss[u+v-2]=((u-1)*m+v);
				if(t[u][v-1])v--;
				else u--;
			}
			u=x,v=y;
			for(;u!=n||v!=m;){
				ss[u+v-2]=((u-1)*m+v);
				if(t2[u+1][v])u++;
				else v++;
			}
			for(int i=1;i<tr;i++){
				// cout<<ss[i]<<' ';
				if(lm[i]==rm[i])continue;
				if(ss[i]==rm[i])ans++;
			}//cout<<endl;
		}
		// cout<<op<<endl;
		ans+=(op*(c-1)-(op)*(op-1)/2);
		if(ans==0)cout<<0;
		else cout<<ans;
	}
}
signed main(){
	ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
	cin>>n>>m;
	for(int i=1;i<=n;i++)cin>>(s[i]+1);
	queue<pii>q;
	q.push({1,1});
	t[1][1]=1;
	while(q.size()){
		int x=q.front().fi,y=q.front().se;
		q.pop();
		if(x<n&&!t[x+1][y]&&s[x+1][y]=='.')q.push({x+1,y}),t[x+1][y]=1;
		if(y<m&&!t[x][y+1]&&s[x][y+1]=='.')q.push({x,y+1}),t[x][y+1]=1;
	}
	q.push({n,m});
	t2[n][m]=1;
	while(q.size()){
		int x=q.front().fi,y=q.front().se;
		q.pop();
		if(x>1&&!t2[x-1][y]&&s[x-1][y]=='.')q.push({x-1,y}),t2[x-1][y]=1;
		if(y>1&&!t2[x][y-1]&&s[x][y-1]=='.')q.push({x,y-1}),t2[x][y-1]=1;
	}
	for(int i=1;i<=n;i++)
		for(int j=1;j<=m;j++)c+=(s[i][j]=='.');
	if(s[1][1]=='*'||s[n][m]=='*'||!t[n][m]){
		if(c>=2)cout<<c*(c-1)/2;
		else cout<<0;
		return 0;
	}
	subqwq::work();
	return 0;
}