// Chelsea Zhang

// Senior Division Contest 1

// Montgomery Blair High School #7096

import java.io.*;

public class PostOffice

{

static double l, h, t;

static int start, end;

static String cost()

{

int n = Math.abs(zone(start)-zone(end));

double cost = 0;

if(within(l,3.5,4.25) && within(h,3.5,6) && within(t,0.007,0.016))

cost = .20+0.03*n;

else if(within(l,4.25,6) && within(h,6,11.5) && within(t,0.007,0.016))

cost = .37+0.03*n;

else if(within(l,3.5,6.125) && within(h,5,11.5) && within(t,0.016,0.25))

cost = .37+0.04*n;

else if(within(l,6.125,24) && within(h,11,18) && within(t,0.25,0.5))

cost = .60+0.05*n;

else if(l >= 6.125 && h >= 11 && t >= 0.25)

{

if(l+2*(h+t) <= 84)

cost = 2.95+0.25*n;

else if(l+2*(h+t) <= 130)

cost = 3.95+0.35*n;

}

if(cost < 0.20)

return "UNMAILABLE";

String output = Double.toString(cost);

if(output.indexOf(".") < 0)

output += ".";

while(output.length()-1 - output.indexOf(".") < 2)

output += "0";

return output;

}

static int zone(int num)

{

if(within(num,1,6999))

return 1;

else if(within(num,7000,19999))

return 2;

else if(within(num,20000,35999))

return 3;

else if(within(num,36000,62999))

return 4;

else if(within(num,63000,84999))

return 5;

else if(within(num,85000,99999))

return 6;

return -1;

}

static boolean within(double x, double a, double b)

{

return (x >= a && x <= b);

}

public static void main(String[] args) throws IOException

{

System.err.println("Please enter each line of input separated by commas and spaces, like this:");

System.err.println("4, 4, .009, 02893, 08516");

BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

StreamTokenizer st = new StreamTokenizer(new BufferedReader(reader));

while(true)

{

st.nextToken();

l = st.nval;

st.nextToken();

st.nextToken();

h = st.nval;

st.nextToken();

st.nextToken();

t = st.nval;

st.nextToken();

st.nextToken();

start = (int)st.nval;

st.nextToken();

st.nextToken();

end = (int)st.nval;

System.out.println(cost() + "\n");

}

}

}