#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int mod = 1000 * 1000 * 1000 + 7;
const int INF = 1000 * 1000 * 1000;
const ll LINF = (ll)INF * INF;
#ifdef DEBUG
#define dbg(x) cout << #x << " = " << (x) << endl << flush;
#define dbgr(s, f) { cout << #s << ": "; for (auto _ = (s); _ != (f); _++) cout << *_ << ' '; cout << endl << flush; }
#else
#define dbg(x) ;
#define dbgr(s, f) ;
#endif
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define fast_io ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define msub(a, b) ((mod + ((ll)(a) - (b)) % mod) % mod)
#define mdiv(a, b) ((ll)(a) * poww((b), mod - 2) % mod)
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define mp make_pair
#define fr first
#define sc second
#define endl '\n'
#define MAXN 3050
int n, m;
char grid[MAXN][MAXN];
int dirs[MAXN][MAXN];
int dp[3][MAXN][MAXN];
inline void filldp(int x, int y)
{
dp[0][x][y] = max(dp[0][x - 1][y + 1], max(dp[1][x - 1][y + 1], dp[2][x - 1][y + 1]));
if (dirs[x][y] & 2)
dp[2][x][y] = dp[0][x][y] + 1;
if (dirs[x][y] & 1)
dp[1][x][y] = max(dp[1][x - 1][y + 1], max(dp[0][x - 2][y + 2], dp[1][x - 2][y + 2])) + 1;
}
int32_t main(void)
{
fast_io;
cin >> n >> m;
FOR(i, 0, n)
{
FOR(j, 0, m)
{
cin >> grid[i][j];
}
}
FOR(i, 0, n)
{
FOR(j, 0, m)
{
if (grid[i][j] == 'R' && grid[i][j + 1] == 'G' && grid[i][j + 2] == 'W')
dirs[i + 1][j + 1] |= 1;
if (grid[i][j] == 'R' && grid[i + 1][j] == 'G' && grid[i + 2][j] == 'W')
dirs[i + 1][j + 1] |= 2;
}
}
FOR(i, 1, m + 1)
{
dp[1][1][i] = dirs[1][i] & 1;
dp[2][1][i] = ((dirs[1][i] & 2) > 0);
}
FOR(i, 2, n + 1)
{
dp[2][i][m] = ((dirs[i][m] & 2) > 0);
}
FOR(i, 2, m + 1)
{
for (int x = 2, y = i - 1; x <= n && y > 0; x++, y--)
{
filldp(x, y);
}
}
FOR(i, 2, n + 1)
{
for (int x = i + 1, y = m - 1; x <= n && y > 0; x++, y--)
{
filldp(x, y);
}
}
int ans = 0;
FOR(i, 1, n + 1)
{
ans += max(dp[0][i][1], max(dp[1][i][1], dp[2][i][1]));
}
FOR(i, 2, m + 1)
{
ans += max(dp[0][n][i], max(dp[1][n][i], dp[2][n][i]));
}
cout << ans << endl;
return 0;
}
