#include <iostream>

 #include<cstring>

 #include<queue>

 #include<cstdlib>

 #include<cstdio>

 using namespace std;

 int map[][],b[][];

 int main()

 {

     int h,w,i,j;

     cin>>h>>w;

     for(i=; i<=h; i++)

     for(j=; j<=w; j++)

     cin>>map[i][j];

     b[h][]=;

     for(i=h; i>=; i--)

     for(j=; j<=w; j++)

     {

         if(map[i][j])

         b[i][j]=;

         else if(i==h&&j>)

         b[i][j]=b[i][j-];

         else if(j==&&i<h)

         b[i][j]=b[i+][j];

         else if(i!=h&&j!=&&map[i][j]!=)

         b[i][j]=b[i+][j]+b[i][j-];

     }

     cout<<b[][w]<<endl;

     return ;

 }