func main()
	var n: int :: cui@inputInt()
	var m: int :: cui@inputInt()
	var ans: int :: 0
	for(1, n)
		var s: []char :: cui@input()
		for i(0, m - 1)
			do ans :+ s[i] = 'R' ?(0, 1)
		end for
	end for
	do cui@print("\{ans}\n")
end func