include <bits/stdc++.h>

using namespace std;

int main() {

double w, d, l, wd, h;
cin >> w >> d >> l >> wd >> h;
double a = 5.0;
if (w > 1) {
	a += ceil(w - 1) * 0.5;
}
double b = 5.0;
if (d > 100) {
	b += ceil(d - 100) * 0.15;
}
double v = l * wd * h / 6000;
double c = 0.0;
if (v > 10) {
	c = floor((v - 10) / 10);
}
printf("%.2lf", a + b + c);

return 0; }