#include <iostream>
using namespace std;

int main() {
	double  N, A, B, X, Y;
	std::cin >>  N >> A >> B >> X >> Y;
	auto discount = 0.;
	if (N > A) discount = X;
	if (N > B) discount = Y;
	auto discount_prc = (100. - discount) / 100.;
	std::cout << N * discount_prc;
}