#include<iostream>
#include<cstring>
#include<string>
#include<algorithm>
#include<cmath>
#include<vector>
using namespace std;
typedef long long ll;
#define rep(i,s,n)for(int i = s;i<n;i++)
#define repe(i,s,n)for(int i = s;i<=n;i++)
static const ll maxLL = (ll)1 << 62;

int main(){
    int h,w;
    cin>>h>>w;
    char a[55][55];
    int cnt =0;
    rep(i,0,h){
        rep(j,0,w){
            cin>>a[i][j];
            if(a[i][j]=='W')cnt++;
        }
    }
    cout<<cnt<<endl;
    return 0;
}