#include <stdio.h>
int main(void){
    int n, m;
    int i, j;
    int ans = 0;
    char line[51];
    scanf( "%d %d", &n, &m );
    for( i = 0; i < n; i++ ){
        scanf( "%s", line );
        for( j = 0; j < m; j++ ){
            if( line[j] == 'W' ){
                ans++;
            }
        }
    }
    printf( "%d\n", ans );
}