#include "bits/stdc++.h"
using namespace std;
#define ar array
signed main(){
ios::sync_with_stdio(0); cin.tie(0);
int n, m; cin>>n>>m;
vector<string> a(n);
for(int i=0;i<n;i++){
cin>>a[i];
}
vector<vector<int>> in(n + m);
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
in[i + j].push_back(i);
}
}
auto can = [&](int i, int j){
return (0 < j && j+1 < m && a[i][j-1] == 'R' && a[i][j] == 'G' && a[i][j+1] == 'W');
};
auto can_ = [&](int i, int j){
return (0 < i && i+1 < n && a[i-1][j] == 'R' && a[i][j] == 'G' && a[i+1][j] == 'W');
};
int res = 0;
for(int s=0;s<n+m;s++){
int k = in[s].size();
vector<ar<int, 3>> dp(k + 1);
for(int l=1;l<=k;l++){
int i = in[s][l-1], j = s - i;
dp[l][0] = max({dp[l-1][0], dp[l-1][1], dp[l-1][2]});
if(can(i, j)) dp[l][1] = max(dp[l-1][0], dp[l-1][1]) + 1;
if(can_(i, j)) dp[l][2] = max(dp[l-1][0], dp[l-1][2]) + 1;
}
res += max({dp[k][0], dp[k][1], dp[k][2]});
//~ cout<<s<<" "<<dp[k][0]<<"\n";
}
cout<<res<<"\n";
}
