Codeforces Round #192 (Div. 2) A. Cakeminator

 #include <iostream>
 #include <vector>
 using namespace std;

 int main(){
     int r,c;
     cin >>r>>c;
     vector<bool> row(r,false),col(c,false);
     char ch;
     for(int i =  ; i < r; i ++ ){
         for(int j =  ; j < c; j ++){
             cin >> ch;
             if(ch == 'S') row[i] = col[j] = true;
         }
     }
     int cnt = ;
     for(int i =  ; i < r; i ++){
         for(int j =  ; j < c; j ++ ){
             if(!row[i] || ! col[j] ) cnt++;
         }
     }
     cout<<cnt<<endl;
     return ;
 }