#include <bits/stdc++.h>
#define endl '\n'
#define int long long
#pragma GCC optimize("O2")
using namespace std;
int n,m;
bool validotd(int &i,int &j,vector<vector<bool>> &vis,vector<string> &x)
{
if(i+2>=n)return false;
if(vis[i][j]||vis[i+1][j]||vis[i+2][j])return false;
if(
j-1>=0&&x[i+1][j-1]=='R'
&&vis[i+1][j-1]==false
&&x[i+1][j]=='G'&&vis[i+1][j]==false
&&j+1<m
&&x[i+1][j+1]=='W'&&vis[i+1][j+1]==false
&&j-2>=0
&&x[i+2][j-2]=='R'&&vis[i+2][j-2]==false
&&x[i+2][j-1]=='G'&&vis[i+2][j-1]==false
&&x[i+2][j]=='W'&&vis[i+2][j]==false
)
return false;
return (x[i][j]=='R'&&x[i+1][j]=='G'&&x[i+2][j]=='W');
}
bool validolr(int &i,int &j,vector<vector<bool>> &vis,vector<string> &x)
{
if(j+2>=m)return false;
if(vis[i][j]||vis[i][j+1]||vis[i][j+2])return false;
return (x[i][j]=='R'&&x[i][j+1]=='G'&&x[i][j+2]=='W');
}
int32_t main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cout.precision(0);
cout<<fixed;
cin>>n>>m;
vector<string> x(n);
for (int i = 0; i < n; i++)
{
cin>>x[i];
}
vector<vector<bool>> vis(n,vector<bool>(m,false));
int c=0;
for (int i = 0; i < n; i++)
{
for (int j = 0; j < m; j++)
{
if(validotd(i,j,vis,x))
{
//cout<<i<<" "<<j<<" td"<<endl;
c++;
vis[i][j]=vis[i+1][j]=vis[i+2][j]=1;
}
if(validolr(i,j,vis,x))
{
//cout<<i<<" "<<j<<" lr"<<endl;
c++;
vis[i][j]=vis[i][j+1]=vis[i][j+2]=1;
}
}
}
cout<<c<<endl;
/*
WWRWWW
WRGWWW
RGWWWW
WWRWWWW
WRGWRGW
WWWWWWw
*/
return 0;
}
