#include <bits/stdc++.h>
#define ll long long
#define ull unsigned ll
#define pb push_back
#define pa pair<int, int>
#define pall pair<ll, int>
#define fi first
#define se second
#define TASK "test"
#define Size(x) (int) x.size()
#define all(x) x.begin(), x.end()
using namespace std;
template<typename T1, typename T2> bool mini (T1 &a, T2 b) {if(a > b) a = b; else return 0; return 1;}
template<typename T1, typename T2> bool maxi (T1 &a, T2 b) {if(a < b) a = b; else return 0; return 1;}
const int MOD = 1e9 + 7;
const int LOG = 20;
const int maxn = 3e3 + 7;
const ll oo = 1e18 + 69;
int n, m;
char a[maxn][maxn];
bool used[maxn][maxn];
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
//freopen(TASK".inp", "r", stdin);
//freopen(TASK".out", "w", stdout);
cin>>n>>m;
for(int i = 1; i <= n; i++) {
for(int j = 1; j <= m; j++) cin>>a[i][j];
}
int ans = 0;
for(int i = 1; i <= min(n, m); i++) {
for(int j = i; j <= m - 2; j++) {
if(used[i][j]) continue;
if(a[i][j] == 'R' && a[i][j + 1] == 'G' && a[i][j + 2] == 'W') {
ans++;
used[i][j] = 1;
}
}
for(int j = i; j <= n - 2; j++) {
if(used[j][i]) continue;
if(a[j][i] == 'R' && a[j + 1][i] == 'G' && a[j + 2][i] == 'W') {
ans++;
used[j][i] = 1;
}
}
}
for(int i = 1; i <= n; i++) {
for(int j = 1; j <= m; j++) {
if(used[i][j]) continue;
if(j + 2 <= m && a[i][j] == 'R' && a[i][j + 1] == 'G' && a[i][j + 2] == 'W') {
ans++;
used[i][j] = 1;
}
if(used[i][j]) continue;
if(i + 2 <= n && a[i][j] == 'R' && a[i + 1][j] == 'G' && a[i + 2][j] == 'W') {
ans++;
used[i][j] = 1;
}
}
}
cout<<ans;
return 0;
}
