import std.stdio;
import std.array;
import std.string;
import std.conv;

void main() {
    string[] input = split(readln());
    int n = to!int(input[0]),
        m = to!int(input[1]);
    
    int ans = 0;
    foreach (i; 0..n) {
        string a = chomp(readln());

        foreach (c; a) {
            if (c == 'W') ans++;
        }
    }
    writeln(ans);
}