#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
#define FOR(i, a, b) for (int i = a, _b = b; i <= _b; ++i)
#define FORD(i, a, b) for (int i = a, _b = b; i >= _b; --i)
#define FORLL(i, a, b) for (ll i = a, _b = b; i <= _b; ++i)
#define FORDLL(i, a, b) for (ll i = a, _b = b; i >= _b; --i)
#define all(x) x.begin(), x.end()
#define uni(x) sort(all(x)), x.erase(unique(all(x)), x.end())
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define dbg(...) debug(#__VA_ARGS__, __VA_ARGS__)
template<typename T>
void __print_one(const char *&s, const T &x)
{
while (*s == ' ') ++s;
const char *p = s;
int bal = 0;
while (*s)
{
if (*s == '(') ++bal;
else if (*s == ')') --bal;
else if (*s == ',' && bal == 0) break;
++s;
}
cerr.write(p, s - p) << " = " << x;
if (*s == ',')
{
++s;
cerr << " , ";
}
}
template<typename... Args>
void debug(const char *s, Args... args)
{
cerr << "[ ";
int dummy[] = { 0 , ( __print_one(s, args) , 0 )... };
(void)dummy;
cerr << " ]\n\n";
}
template<class X>
bool maximize(X &a, X b)
{
if (a < b)
{
a = b;
return true;
}
return false;
}
template<class X>
bool minimize(X &a, X b)
{
if (a > b)
{
a = b;
return true;
}
return false;
}
// --------------------------------------------------------------------------------------------
const int maxn = 3003;
int n, m, dp[maxn][3];
char dango[maxn][maxn];
// --------------------------------------------------------------------------------------------
bool valid(int x, int y)
{
return x >= 1 && x <= n && y >= 1 && y <= m;
}
bool checkNgang(int x, int y)
{
if (!valid(x, y) || !valid(x, y + 1) || !valid(x, y + 2)) return false;
if (dango[x][y] != 'R' || dango[x][y + 1] != 'G' || dango[x][y + 2] != 'W') return false;
return true;
}
bool checkDoc(int x, int y)
{
if (!valid(x, y) || !valid(x + 1, y) || !valid(x + 2, y)) return false;
if (dango[x][y] != 'R' || dango[x + 1][y] != 'G' || dango[x + 2][y] != 'W') return false;
return true;
}
ll calc(int x, int y)
{
dp[y - 1][0] = 0;
dp[y - 1][1] = -1e9;
dp[y - 1][2] = -1e9;
int sta = y;
while (valid(x, y))
{
dp[y][0] = max({dp[y - 1][0], dp[y - 1][1], dp[y - 1][2]});
if (checkNgang(x, y)) dp[y][1] = max({dp[y - 1][0], dp[y - 1][1], dp[y - 1][2]}) + 1;
if (checkDoc(x, y))
{
dp[y][2] = dp[y - 1][2] + 1;
if (y - 2 >= 0)
dp[y][2] = max(dp[y][2], max(dp[y - 2][0], dp[y - 2][2]) + 1);
}
--x;
++y;
}
int res = max({dp[y - 1][0], dp[y - 1][1], dp[y - 1][2]});
FOR(i, sta, y)
FOR(j, 0, 2)
dp[i][j] = -1e9;
return res;
}
void solve()
{
cin >> n >> m;
FOR(i, 1, n)
FOR(j, 1, m)
cin >> dango[i][j];
int res = 0;
FOR(i, 1, n)
res += calc(i, 1);
FOR(i, 2, m)
res += calc(n, i);
cout << res;
}
signed main()
{
ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define TASK "TEST"
if (fopen(TASK".INP", "r"))
{
freopen(TASK".INP", "r", stdin);
freopen(TASK".OUT", "w", stdout);
}
solve();
return 0;
}
