#include<bits/stdc++.h>
using namespace std;
//#define int long long
const int TAILLE_MAX=3000+5;
int nbLig,nbCol,rep;
char val[TAILLE_MAX][TAILLE_MAX];
int memo[TAILLE_MAX][8];
int dyna(int lig,int col,int preced) {
if (lig<0 or col>=nbCol) {
return 0;
}
int ans=memo[lig][preced];
if (ans!=-1) {
return ans;
}
int coin=4*(preced%2);
ans=dyna(lig-1,col+1,coin);
if (preced/2==0 and val[lig][col]=='R' and val[lig+1][col]=='G' and val[lig+2][col]=='W') {
ans++;
}
if (val[lig][col]=='R' and val[lig][col+1]=='G' and val[lig][col+2]=='W') {
ans=max(ans,dyna(lig-1,col+1,coin+3)+1);
}
memo[lig][preced]=ans;
return ans;
}
void calc(int lig,int col) {
for (int i=0;i<nbLig;i++) {
for (int j=0;j<8;j++) {
memo[i][j]=-1;
}
}
rep+=dyna(lig,col,0);
}
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
cin>>nbLig>>nbCol;
for (int i=0;i<nbLig;i++) {
for (int j=0;j<nbCol;j++) {
cin>>val[i][j];
}
}
for (int i=0;i<nbLig;i++) {
calc(i,0);
}
for (int j=1;j<nbCol;j++) {
calc(nbLig-1,j);
}
cout<<rep<<endl;
return 0;
}
