#include<stdio.h>

int main(void){
    int n, m, i, j, t;
    char a[51][51];
    scanf("%d%d", &n, &m);
    for(i=0;i<n;i++){
        for(j=0;j<=m;j++){
            scanf("%c", &a[i][j]);
            if(a[i][j] == 'W') t++;
        }
    }
    printf("%d",t);
    return 0;
}