#include <bits/stdc++.h>
using namespace std;
#define _ <<" "<<
#define sz(x) ((int) (x).size())
typedef pair<int, int> pii;
typedef long long ll;
const int maxn = 2000 + 5;


int n, m;
char A[maxn][maxn];
vector<int> pos[maxn];

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> m;
    for (int i = 1;i <= n; ++i) {
        for (int j = 1;j <= m; ++j) {
            cin >> A[i][j];
            A[1][1] = '_';
            if (A[i][j] == 'C') pos[i].push_back(j);
        }
    }
    int ans = 0;

    function<void(int,int)> go = [&](int x,int y) {
        if (x > n) return;
        // cout << ans _ x _ y << endl;
        if (pos[x].empty() || pos[x].back() < y) {
            go(x+1, y);
            return;
        }
        int ty = pos[x].back();
        while (!pos[x].empty() && pos[x].back() >= y) pos[x].pop_back();
        go(x, ty);
    };

    for (int i = 1;i <= n; ++i) {
        if (!pos[i].empty()) {
            ans++;
            go(i, 1);
        }
    }
    cout << ans << '\n';
    return 0;
}