#include <bits/stdc++.h>
/*
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
*/
using namespace std;
// using namespace __gnu_pbds;
using namespace chrono;
// mt19937 rng((int) std::chrono::steady_clock::now().time_since_epoch().count());
/*
template <class T> using ordered_set = tree <T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;
*/
//***************** CONSTANTS *****************
//***************** GLOBAL VARIABLES *****************
char grid[3002][3002];
int dp[3002][3002][3];
//***************** AUXILIARY STRUCTS *****************
//***************** MAIN BODY *****************
void solve(){
int N, M;
cin >> N >> M;
for(int i = 1; i <= N; i++)
for(int j = 1; j <= M; j++)
cin >> grid[i][j];
function<bool(int, int)> vert = [&](int i, int j)->bool{
return grid[i][j] == 'G' && grid[i-1][j] == 'R' && grid[i+1][j] == 'W';
};
function<bool(int, int)> hor = [&](int i, int j)->bool{
return grid[i][j] == 'G' && grid[i][j-1] == 'R' && grid[i][j+1] == 'W';
};
for(int i = 1; i <= N; i++){
for(int j = 1; j <= M; j++){
for(int k = 0; k < 3; k++)
dp[i][j][0] = max(dp[i][j][0], dp[i-1][j+1][k]);
if(vert(i, j)) dp[i][j][1] = max(dp[i-1][j+1][0], dp[i-1][j+1][1]) + 1;
if(hor(i, j)) dp[i][j][2] = max(dp[i-1][j+1][0], dp[i-1][j+1][2]) + 1;
}
}
int ans = 0;
for(int i = 1; i <= N; i++)
ans += max({dp[i][1][0], dp[i][1][1], dp[i][1][2]});
for(int i = 2; i <= M; i++)
ans += max({dp[N][i][0], dp[N][i][1], dp[N][i][2]});
cout << ans << '\n';
}
//***************** *****************
int32_t main(){
ios_base::sync_with_stdio(NULL);
cin.tie(NULL);
#ifdef LOCAL
auto begin = high_resolution_clock::now();
#endif
int tc = 1;
// cin >> tc;
for (int t = 0; t < tc; t++)
solve();
#ifdef LOCAL
auto end = high_resolution_clock::now();
cout << fixed << setprecision(4);
cout << "Execution Time: " << duration_cast<duration<double>>(end - begin).count() << "seconds" << endl;
#endif
return 0;
}
/*
If code gives a WA, check for the following :
1. I/O format
2. Are you clearing all global variables in between tests if multitests are a thing
3. Can you definitively prove the logic
*/
