#pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>
#pragma pack(0)
#define ll long long
#define pii pair<ll, ll>
#define pll pair<ll, ll>
#define F first
#define S second
#define MOD 1000000007
#define MOD2 998244353
#define _INFINITY 9223372036854775807
#define fast ios::sync_with_stdio(0), cin.tie(0)
using namespace std;
int n, m, r, f;
signed main()
{
cin >> n >> m;
for (int i = 1; i <= n * m; i++)
{
char c;
cin >> c;
if(c == 'R')
r = 1;
else if(c == 'F')
f = 1;
}
cout << r + f << '\n';
}
