#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(LL i = a;i<b; i++)
#define rrep(i,a,b) for(LL i = a;i>b; i--)
#define INF ((1LL<<62)-(1LL<<31))
#define ooki 9,223,372,036,854,775,807
#define tii -9,223,372,036,854,775,808
typedef long long LL;
int main(){
  LL a,b,count=0;
  cin >> a >> b;
  rep(i,0,a){
    rep(j,0,b){
      char c;
      cin >> c;
      if(c=='W'){count++;}
    }
  }
  cout << count << endl;
}