#include <bits/stdc++.h>
using namespace std;
#define endl "\n"
#define pb push_back
#define int long long
#define fi first
#define se second
const int N = 3e3 + 5, M = 1e9 + 7, LG = 20;
int n , m;
char gr[N][N];
void solve(){
cin >> n >> m;
bool R = 0 , F = 0 ;
int sz = 0;
for (int i=1 ; i<=n ; i++){
for (int j=1 ; j<=m ; j++){
cin >> gr[i][j];
if (gr[i][j] == 'F') F = 1;
if (gr[i][j] == 'R') R = 1;
}
}
if (R) sz++;
if (F) sz++;
cout << sz << endl;
}
signed main(){
ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int ts = 1;
// cin >> ts;
while(ts--){
solve();
}
}
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