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#include <bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
 
using namespace std;
using namespace chrono;
using namespace __gnu_pbds;
 
#define loop(i,a,b) for(int i=a;i<b;i++)
#define range(a)    a.begin(),a.end()
#define pb(a)        push_back(a)
#define mp          make_pair 
#define ff first
#define ss second
#define pqb             priority_queue<int>
#define pqs             priority_queue<int,vi,greater<int> >
#define w(x)            int x; cin>>x; while(x--)
#define tr(it, a) for(auto it = a.begin(); it != a.end(); it++)
#define mii    map<int, int>    
#define umii   unordered_map<int, int>    
#define mll    map<ll, ll>    
#define umll   unordered_map<ll, ll>
#define pii    pair<int, int>    
#define pll     pair<ll, ll>
#define vi     vector<int>    
#define vl      vector<ll>    
#define si      set<int>    
#define sl      set<ll>    
#define vpii     vector<pii>    
#define vpll      vector<pl>    
#define vvi       vector<vi>    
#define  vvl       vector<vl>
#define MOD 1000000007
 
//**************************//
#define fastinout ios_base::sync_with_stdio(false);cin.tie(NULL); cout.tie(NULL);  
#ifndef vk20july
#define debug(x) cerr<<#x<<" ";_print(x); cerr<<endl;
#else
#define debug(x)
#endif
//**********************//
 
//*********************//
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double lld;
typedef tree<pair<ll, ll>, null_type, less<pair<ll, ll>>, rb_tree_tag, tree_order_statistics_node_update > pbds; // find_by_order, order_of_key
 
void _print(ll t) {cerr << t;}
void _print(int t) {cerr << t;}
void _print(string t) {cerr << t;}
void _print(char t) {cerr << t;}
void _print(lld t) {cerr << t;}
void _print(double t) {cerr << t;}
void _print(ull t) {cerr << t;}
 
template <class T, class V> void _print(pair <T, V> p);
template <class T> void _print(vector <T> v);
template <class T> void _print(set <T> v);
template <class T, class V> void _print(map <T, V> v);
template <class T> void _print(multiset <T> v);
template <class T, class V> void _print(pair <T, V> p) {cerr << "{"; _print(p.ff); cerr << ","; _print(p.ss); cerr << "}";}
template <class T> void _print(vector <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
template <class T> void _print(set <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
template <class T> void _print(multiset <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void _print(map <T, V> v) {cerr << "[ "; for (auto i : v) {_print(i); cerr << " ";} cerr << "]";}
void _print(pbds v) {cerr << "[ "; for (auto i : v) {_print(i); cerr << " ";} cerr << "]";}
 
//**************************//
 
//************************************//
ll expo(ll a,ll b,ll mod){ll ans=1;while(b>0){if(b&1){ans=(ans*a)%mod;}a=(a*a)%mod;b>>=1;}return ans;}
ll gcd(ll a, ll b) {if (b > a) {return gcd(b, a);} if (b == 0) {return a;} return gcd(b, a % b);}
ll phin(ll n) {ll number = n; if (n % 2 == 0) {number /= 2; while (n % 2 == 0) n /= 2;} for (ll i = 3; i <= sqrt(n); i += 2) {if (n % i == 0) {while (n % i == 0)n /= i; number = (number / i * (i - 1));}} if (n > 1)number = (number / n * (n - 1)) ; return number;} //O(sqrt(N))
vector<ll> sieve(int n) {int*arr = new int[n + 1](); vector<ll> vect; for (int i = 2; i <= n; i++)if (arr[i] == 0) {vect.push_back(i); for (int j = 2 * i; j <= n; j += i)arr[j] = 1;} return vect;}
//************************************//
 
ll rec(vvl &dp,vector<vector<char>>&g,int i, int j,int n){
   if( i>n-1 || j>n-1)
      return 0;
   if(g[i][j]=='*')
      return 0;
   if(i==n-1 && j==n-1)
      return 1;
   if(dp[i][j]!=0)
      return dp[i][j];
 
   ll cnt1=(rec(dp,g,i,j+1,n))%MOD;//right path
   ll cnt2=(rec(dp,g,i+1,j,n))%MOD;// down path
   dp[i][j]=cnt1+cnt2;
   return dp[i][j];
}
void solve(){
   // auto sgn = [&](int x) {
   //    if (x > 0) return 1;
   //    else return -1;
   // }
   int n;
   cin>>n;
   vector<vector<char>>g;
   for(int i=0;i<n;i++){
      vector<char>g1;
      for(int j=0;j<n;j++){
         char c;
         cin>>c;
         g1.pb(c);
      }
      g.pb(g1);
   }
   vvl dp(n,vector<ll>(n,0));
   if(n==1)
      if(g[0][0]!='*')
         dp[0][0]=1;
   rec(dp,g,0,0,n);
   cout<<dp[0][0]<<endl;
}
int main(){
   fastinout;
   #ifndef ONLINE_JUDGE
      freopen("Error.txt","w",stderr);
   #endif
   solve();
   // vl x(n),y(n);
   // for(int i=0;i<n;i++){
   //    cin>>x[i];
   // }
   // for(int i=0;i<n;i++){
   //    cin>>y[i];
   // }
   //aise vector bnao and input lo fast tarika hai 
   
}