#include <bits/stdc++.h>
using namespace std;
const int NMAX=3e3;
string a[NMAX+5];
int n, m, used[NMAX+5][NMAX+5];
int main ()
{
ios_base :: sync_with_stdio (0);
cin.tie (nullptr);
cin >> n >> m;
for (int i=0;i<n;i++)
cin >> a[i];
int ans=0;
for (int i=0;i<n;i++)
{
for (int j=0;j<m;j++)
{
if (a[i][j]!='R')
continue;
if (j<m-2 && used[i][j+1]+used[i][j+2]==0 && a[i][j+1]=='G' && a[i][j+2]=='W')
ans++;
else if (i<n-2 && a[i+1][j]=='G' && a[i+2][j]=='W' && used[i+1][j]+used[i+2][j]==0)
{
if (j>0 && j<m-1 && a[i+1][j-1]=='R' && a[i+1][j+1]=='W' && !used[i+1][j+1])
used[i+1][j]=1;
else
used[i+2][j]=1;
ans++;
}
}
}
cout << ans;
return 0;
}
