#include <bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define pb push_back
typedef long long ll;
typedef pair<int,int> pii;
const int INF = 1e8;
const int S = 1e7;
bool ready[S] = {false};
int value[S];
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
int h, w; cin >> h >> w;
vector<vector<char>> meadow (h, vector<char> (w));
int ans = 0;
for(int i = 0; i < h; i++){
for(int j = 0; j < w; j++){
char x; cin >> x;
meadow[i][j] = x;
if(ans == 2) continue;
if(x == 'R') ans++;
if(x == 'F') ans++;
}
}
cout << ans << "\n";
}
/*
*
*/
