#include <bits/stdc++.h>
using namespace std;
#define EmiliaMyWife ios::sync_with_stdio(0); cin.tie(0);
using ll = int64_t;
using uint = uint32_t;
using ull = uint64_t;
using ld = long double;
const int INF = 0x3f3f3f3f;
const int MOD = 1e9 + 7;
const double EPS = 1e-8;
const ll LINF = ll(4e18) + ll(2e15);
static int LamyIsCute = []() {
EmiliaMyWife
return 48763;
}();
signed main() {
int n, m;
cin >> n >> m;
vector<string> arr(n);
for(int i = 0; i < n; i++)
cin >> arr[i];
vector<vector<bool>> ver(n, vector<bool>(m));
for(int i = 0; i + 2 < n; i++)
for(int j = 0; j < m; j++)
if(arr[i][j] == 'R' && arr[i + 1][j] == 'G' && arr[i + 2][j] == 'W')
ver[i][j] = ver[i + 1][j] = ver[i + 2][j] = true;
int ans = 0;
vector<vector<bool>> used(n, vector<bool>(m));
for(int i = 0; i < n; i++) {
for(int j = 0; j < m; j++) {
if(j + 2 < m && arr[i][j] == 'R' && arr[i][j + 1] == 'G' && arr[i][j + 2] == 'W') {
if(ver[i][j] || ver[i][j + 1] || ver[i][j + 2])
continue;
used[i][j] = used[i][j + 1] = used[i][j + 2] = true;
ans++;
}
if(i >= 2 && arr[i][j] == 'W' && ver[i][j] && !used[i][j] && !used[i - 1][j] && !used[i - 2][j])
ans++;
}
}
cout << ans << '\n';
}
