from pprint import pprint
def main():
    n,m=map(int,input().split())
    a=[]
    for i in range(n):
        a.append(input())
    cnt=0
    for i in range(len(a)):
        for j in range(len(a[i])):
            if a[i][j]=="W":
                cnt+=1
    print(cnt)
    

if __name__ == "__main__":
    main()