#include<iostream>
#include<vector>
using namespace std;
int h,w,ans=0;
vector<vector<char>>grid;
void f(int a,int b,int count){
  if(a==h-1 && b==w-1){
    ans++;
    return;
  }
  if(b+1<w){
    if(grid[a][b+1]=='o')f(a,b+1,count+1);
    else if(grid[a][b+1]=='x' && count)f(a,b+1,count-1);
  }
  if(a+1<h){
    if(grid[a+1][b]=='o')f(a+1,b,count+1);
    else if(grid[a+1][b]=='x' && count)f(a+1,b,count-1);
  }
}
int main()
{
  cin >> h >> w;
  for(int i=0;i<h;i++){
    string s;
    cin >> s;
    grid.push_back({});
    for(int j=0;j<w;j++)grid[i].emplace_back(s[j]);
  }
  f(0,0,1);
  cout << ans << endl;
}