def add(a, b)
	a + b
end

def mul(a, b)
	a * b
end

N, M, K = gets.split(" ").map{|s| s.to_i}
op, *b = gets.split(" ")
b = b.map{|s| s.to_i}.sort!
a = []
N.times {
	a << gets.to_i
}
a.sort!

op = (op == "+" ? method(:add) : method(:mul))

cnt = 0
j = M - 1
0.upto(N-1) {|i|
	while j >= 0 do 
		if op.call(a[i], b[j]) < K then
			break
		end
		j -= 1
	end
	cnt += M - 1 - j
}

puts cnt