#include <bits/stdc++.h>
#define int long long
using namespace std;
char c[3000][3001];
bool a[3000][3000];
signed main(){
int n,m;
cin>>n>>m;
for(int i=0;i<n;i++)
for(int j=0;j<m;j++)
cin>>c[i][j];
int ans=0;
for(int i=0;i<n;i++){
for(int j=0;j+2<m;j++){
if(!a[i][j] && !a[i][j+1] && !a[i][j+2] &&
c[i][j]=='R' && c[i][j+1]=='G' && c[i][j+2]=='W'){
a[i][j]=a[i][j+1]=a[i][j+2]=true;
ans++;
}
}
}
for(int j=0;j<m;j++){
for(int i=0;i+2<n;i++){
if(!a[i][j] && !a[i+1][j] && !a[i+2][j] &&
c[i][j]=='R' && c[i+1][j]=='G' && c[i+2][j]=='W'){
a[i][j]=a[i+1][j]=a[i+2][j]=true;
ans++;
}
}
}
cout<<ans;
}
