include <stdio.h>

include <math.h>

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; }