#include <bits/stdc++.h>
using namespace std;
int main() {
ios_base::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
long long n,m;
cin >> n >> m;
vector<string> v(n);
for (int i = 0; i < n; i++) {
cin >> v[i];
}
vector<vector<bool>> a(n, vector<bool>(m, false));
int ans = 0;
for (int i = 0;i<n;i++) {
for (int j = 0;j<m;j++) {
if ((i+j) % 2 == 0) {
if (j<m-2 && v[i][j] == 'R' && v[i][j+1] == 'G' && v[i][j+2] == 'W') {
if (!a[i][j] && !a[i][j+1] && !a[i][j+2]) {
a[i][j] = true;
a[i][j+1] = true;
a[i][j+2] = true;
ans++;
continue;
}
}
if (i<n-2 && v[i][j] == 'R' && v[i+1][j] == 'G' && v[i+2][j] == 'W') {
if (!a[i][j] && !a[i+1][j] && !a[i+2][j]) {
a[i][j] = true;
a[i+1][j] = true;
a[i+2][j] = true;
ans++;
}
}
}
else {
if (i<n-2 && v[i][j] == 'R' && v[i+1][j] == 'G' && v[i+2][j] == 'W') {
if (!a[i][j] && !a[i+1][j] && !a[i+2][j]) {
a[i][j] = true;
a[i+1][j] = true;
a[i+2][j] = true;
ans++;
continue;
}
}
if (j<m-2 && v[i][j] == 'R' && v[i][j+1] == 'G' && v[i][j+2] == 'W') {
if (!a[i][j] && !a[i][j+1] && !a[i][j+2]) {
a[i][j] = true;
a[i][j+1] = true;
a[i][j+2] = true;
ans++;
}
}
}
}
}
cout << ans << endl;
return 0;
}
