include <bits/stdc++.h>

using namespace std;

int main() {

double a, b, c, d, e, h, f = 0; scanf("%lf%lf%lf%lf%lf", &a, &b, &c, &d, &e); a = ceil(a); if (a <= 1) {

f = f + 5;

} else {

f = f + 5 + (a - 1) * 0.5;

} b = ceil(b); if (b <= 100) {

f = f + 5;

} else {

f = f + 5 + (b - 100) * 0.15;

} h = (c d e) / 6000; int t = h / 10; if (h <= 10) {

f = f + 0;

} else {

f = f + 0 + (t - 1);

} printf("%.2lf", f); return 0; }