include
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 / 6000.0;
double c = 0.0;
if (v > 10) {
c = floor((v - 10) / 10);
}
printf("%.2lf", a + b + c);
return 0;
}