#include<iostream>
#include<vector>
using namespace std;
 
int sol(int i,int j,vector<vector<char>>v,int h,int w){
    if(i>h || j>w){
        return 0;
    }
    if(i==h && j==w){
        return 1;
    }
    if(v[i][j]=='#'){
        return 0;
    }
    return sol(i+1,j,v,h,w) + sol(i,j+1,v,h,w);
}
 
int main(){
    int h,w;
    cin>>h>>w;
    vector<vector<char>>v(h);
    char c;
    for(int i=0;i<h;i++){
        for(int j=0;j<w;j++){
            cin>>c;
            v[i].push_back(c);
        }
    }
    h--;
    w--;
    cout<<sol(0,0,v,h,w)<<endl;
}

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