#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
int gcd(int a,int b){return b?gcd(b,a%b):a;}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n,m,cnt=0;
    char c;
    cin >> n >> m;
    n*=m;
    rep(i,n) { cin >> c; cnt+=c=='W'?1:0; }
    cout << cnt << endl;
    return 0;
}