#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define rep(a, b) for(int a = 0; a < (b); ++a)
#define st first
#define nd second
#define pb push_back
#define all(a) a.begin(), a.end()
const int LIM=3e3+7;
string T[LIM];
int main() {
ios_base::sync_with_stdio(0); cin.tie(0);
int n, m;
cin >> n >> m;
int ans=0;
rep(i, n) {
cin >> T[i];
rep(j, m-2) if(T[i][j]=='R' && T[i][j+1]=='G' && T[i][j+2]=='W') {
T[i][j]=T[i][j+1]=T[i][j+2]='.';
++ans;
}
}
rep(j, m) rep(i, n-2) if(T[i][j]=='R' && T[i+1][j]=='G' && T[i+2][j]=='W') {
T[i][j]=T[i+1][j]=T[i+2][j]='.';
++ans;
}
cout << ans << '\n';
}
