#include "bits/stdc++.h"
using namespace std;
void solve();
bool multitest();
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
clock_t TIME = clock();
int TEST = 1;
if (multitest()) cin >> TEST;
while (TEST--) solve();
cerr << "\nUsed: " << clock() - TIME << " ms\n\n";
}
bool multitest() {
return 0;
}
int n, m;
char a[4005][4005];
bool visited[4005][4005], F, R;
void dfs(int x, int y) {
if (a[x][y] == 'F') F = 1;
if (a[x][y] == 'R') R = 1;
visited[x][y] = 1;
for (int i = max(x-1, 1); i <= min(x+1, n); ++i)
for (int j = max(y-1, 1); j <= min(y+1, m); ++j)
if ((i != x || j != y) && a[i][j] != '.' && !visited[i][j])
dfs(i, j);
}
void solve() {
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 <= n; ++i)
for (int j = 1; j <= m; ++j)
if (a[i][j] != '.' && !visited[i][j]) {
F = R = 0;
dfs(i, j);
ans += F + R;
}
cout << ans;
}
