#include <bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
#define pb push_back
#define F first
#define S second
#define endl "\n"
const int INF = 1e18+10;
const int MOD = 1e9+7;
int n, m;
string t[4040];
int32_t main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> m;
bool aa, bb;
for(int i = 0; i < n; i++) {
cin >> t[i];
}
for(int i = 0; i < n; i++) {
for(int j = 0; j < m; j++) {
if(t[i][j] == 'F') aa = true;
if(t[i][j] == 'R') bb = true;
}
}
cout << aa + bb << endl;
return 0;
}
