Ndata = input();
NdataS = Ndata.split(" ");
result = 0;

gyoindex = int(NdataS[0]);
retuindex = int(NdataS[1]);

for gyo in range(0,gyoindex):
	gyono = input();
	for retu in range(0,retuindex):
		if gyono[retu] == "W":
			result = result + 1;

print(result);