#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#define error(args...) { string _s = #args; replace(_s.begin(), _s.end(), ',', ' '); stringstream _ss(_s); istream_iterator<string> _it(_ss); err(_it, args); }
#define sz(x) (int)x.size()
#define all(x) x.begin(),x.end()
#define gtr(T) vector<T>,greater<T>
#define int long long
using namespace std;
using namespace __gnu_pbds;
template<class T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

void err(istream_iterator<string> it) { cerr << endl; }

template<typename T, typename... Args>
void err(istream_iterator<string> it, T a, Args... args) {
    cerr << *it << " = " << a << endl;
    err(++it, args...);
}

#define S second
#define F first
using ll = long long;
using ld = long double;
using pii = pair<int, int>;
using vi = vector<int>;
using vvi = vector<vector<int>>;
const int N = 2000;
int a[N][N], n, m;

bool work() {
    int curR = 1, curC = 1;
    bool flag = 0;
    for (int i = curR; i <= n; i++) {
        for (int j = curC; j <= m; j++) {
            if (a[i][j] == 1)
                curC = j, a[i][j] = 0, flag = 1;
        }
    }
    return flag;
}

signed main() {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    cin >> n >> m;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            char x;
            cin >> x;
            a[i][j] = x == 'C';
        }
    }
    int cnt = 0;
    while (work())
        cnt++;
    cout << cnt << endl;
    return 0;
}