#include <bits/stdc++.h>
using namespace std;
const int MAXN =3000;
char couleur[MAXN][MAXN];
bool pris[MAXN][MAXN];
signed main(void)
{
ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
int nbLig, nbCol;
cin >> nbLig >> nbCol;
for (int iLig(0); iLig < nbLig; ++iLig)
for (int iCol(0); iCol < nbCol; ++iCol)
cin >> couleur[iLig][iCol];
int sol(0);
for (int iLig(nbLig-1); iLig >= 0; --iLig)
for (int iCol(0); iCol < nbCol; ++iCol)
if (couleur[iLig][iCol] == 'R')
{
if (iLig + 2 < nbLig and couleur[iLig+1][iCol] == 'G'
and couleur[iLig+2][iCol] == 'W' and !pris[iLig+1][iCol]
and !pris[iLig+2][iCol])
sol++;
else if (iCol + 2 < nbCol and couleur[iLig][iCol+1] == 'G'
and couleur[iLig][iCol+2] == 'W')
{
pris[iLig][iCol+1] = pris[iLig][iCol+2] = true;
sol++;
}
}
cout << sol << endl;
}
