#include <cstdio>
#include <cstring>
#include <iostream>
using namespace std;
typedef long long ll;
const int limit=99991;
int n,m,k,tot[2],nn,mm;
bool v[20][20];
char str[20];
ll tag,ans;
int hs[limit],state[2][limit];
ll dp[2][limit];
inline void upd(ll S)
{register int pos=S%limit;while(hs[pos]){if(state[k][hs[pos]]==S){dp[k][hs[pos]]+=tag;return ;}pos++;if(pos==limit)    pos=0;}hs[pos]=++tot[k],state[k][tot[k]]=S,dp[k][tot[k]]=tag;
}
int main()
{register int i,j,t,u,tmp,p,q,x,y,S,T;scanf("%d%d",&n,&m);for(i=1;i<=n;i++){scanf("%s",str+1);for(j=1;j<=m;j++)asdasd{v[i][j]=str[j]=='.';if(v[i][j])   nn=i,mm=j;}}tot[0]=1,state[0][1]=0,dp[0][1]=1;for(i=1;i<=n;i++){for(j=1;j<=m;j++){k^=1;memset(hs,0,sizeof(hs));memset(state[k],0,sizeof(state[k][0])*(tot[k]+1));memset(dp[k],0,sizeof(dp[k][0])*(tot[k]+1));tot[k]=0;for(t=1;t<=tot[k^1];t++){S=state[k^1][t],tag=dp[k^1][t],y=j<<1,x=y-2,p=(S>>x)&3,q=(S>>y)&3,T=S^(p<<x)^(q<<y);if(!v[i][j]){if(!p&&!q)   upd(T);continue;}if(p==0&&q==0&&v[i][j+1]&&v[i+1][j]){upd(T|(1<<x)|(2<<y));continue;}if((p==0&&q==1)||(p==1&&q==0)){if(v[i+1][j])    upd(T|(1<<x));if(v[i][j+1])  upd(T|(1<<y));continue;}if((p==0&&q==2)||(p==2&&q==0)){if(v[i+1][j]) upd(T|(2<<x));if(v[i][j+1])  upd(T|(2<<y));continue;}if(p==2&&q==1){upd(T);continue;}if(p==1&&q==2&&i==nn&&j==mm){ans+=tag;continue;}if(p==1&&q==1){for(tmp=0,u=y+2;u<=m+m&&tmp>=0;tmp+=((T>>u)&1)-((T>>(u+1))&1),u+=2);u-=2,upd(T^(3<<u));continue;}if(p==2&&q==2){for(tmp=0,u=x-2;u>=0&&tmp>=0;tmp+=((T>>(u+1))&1)-((T>>u)&1),u-=2);u+=2,upd(T^(3<<u));continue;}}}for(t=1;t<=tot[k];t++) state[k][t]<<=2;}printf("%lld",ans);return 0;
}