#include<bits/stdc++.h>
#define int long long 
using namespace std;
int n,m;
char a[3005][3005];
bool f[3005][3005];
bool g[3006][3005];
int ans;
vector<int>xl[6005];
int num;
signed main(){
	cin.tie(0)->sync_with_stdio(0);
	//freopen("1.in","r",stdin);
	cin>>n>>m;
	for(int i=1;i<=n;++i)
		for(int j=1;j<=m;++j){
			cin>>a[i][j];
			num+=(a[i][j]=='.');
		}
	if(a[1][1]=='*'){cout<<num*(num-1)/2<<'\n';return 0;}
	f[1][1]=1;
	for(int i=1;i<=n;++i)
		for(int j=1;j<=m;++j){
			if(a[i][j]=='*')continue;
			if(i==j and i==1)continue;
			f[i][j]=(f[i-1][j] or f[i][j-1]);
		}
	if(!f[n][m]){cout<<num*(num-1)/2<<'\n';return 0;}
	g[n][m]=1;
	for(int i=n;i;--i)
		for(int j=m;j;--j){
			if(g[i][j]=='*')continue;
			if(i==n and j==m)continue;
			g[i][j]=(g[i+1][j] or g[i][j+1]);
		}
	for(int i=1;i<=n;++i)
		for(int j=1;j<=m;++j){
			if(f[i][j] and g[i][j])
				xl[i+j].push_back(i);
		}
	int tp=0;
	for(int i=1;i<=n+m;++i){
		if(xl[i].size()==1)
			ans+=num-1-(tp++);
	}
	for(int i=2;i<=n+m;++i){
		if(xl[i].size()==1)continue;
		int x1=xl[i][1],x2=*(--xl[i].end());
		if(x1==x2)++ans;
		for(int j=i+1;j<=n+m;++j){
			if(!f[x1][j-x1] or !g[x1][j-x1])++x1;
			if(f[x2+1][j-x2-1] and g[x2+1][j-x2-1])++x2;
			if(x1==x2 and xl[j].size()!=1)++ans;
		}
	}
	for(int i=2;i<=n+m;++i){
		if(xl[i].size()==1)continue;
		int x1=xl[i][0],x2=*(--(--xl[i].end()));
		for(int j=i+1;j<=n+m;++j){
			if(!f[x1][j-x1] or !g[x1][j-x1])++x1;
			if(f[x2+1][j-x2-1] and g[x2+1][j-x2-1])++x2;
			if(x1==x2 and xl[j].size()!=1)++ans;
		}
	}
	cout<<ans<<'\n';
	return 0;
}