#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;
}
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