#include <bits/stdc++.h>
// #pragma GCC optimize("Ofast,no-stack-protector,unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define int long long
#define ll long long
#define pii pair<int, int>
#define all(v) v.begin(), v.end()
using namespace std;
const int oo = 1e9 + 9;
const int MAX = 4e5 + 5, LOGMAX = 20, B = 441, MOD = 998244353;
void solve(){
int n, m; cin >> n >> m;
bool r = 0, f = 0;
for(int i = 1; i <= n; i++){
for(int j = 1; j <= m; j++){
char c; cin >> c;
if(c == 'R') r = 1;
if(c == 'F') f = 1;
}
}
cout << r + f << '\n';
}
signed main(){
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int t = 1;
// cin >> t;
while(t--) solve();
}
