//Margaret Lin

//Taylor HS

//Senior 5

import java.util.*;

import java.io.*;

public class ACSL_1_MLin

{

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

{

Scanner in = new Scanner(System.in);

for(int hi=0;hi<5;hi++)

{

int x=in.nextInt();

ArrayList<Double> daily = new ArrayList<Double>();

//finding number of hours worked per week

for(int bye=0;bye<7;bye++)

{

//getting start time

double start_time=0;

String s = in.next();

switch (s)

{

case "1":

start_time=0; break;

case "2":

start_time=0.5; break;

case "3":

start_time=1; break;

case "4":

start_time=1.5; break;

case "5":

start_time=2; break;

case "6":

start_time=2.5; break;

case "7":

start_time=3; break;

case "8":

start_time=3.5; break;

case "9":

start_time=4; break;

case "A":

start_time=4.5; break;

case "B":

start_time=5; break;

case "C":

start_time=5.5; break;

case "D":

start_time=6; break;

case "E":

start_time=6.5; break;

case "F":

start_time=7; break;

case "G":

start_time=7.5; break;

case "H":

start_time=8; break;

}

//getting end time

double end_time=0;

s = in.next();

switch (s)

{

case "1":

end_time=0; break;

case "2":

end_time=0.5; break;

case "3":

end_time=1; break;

case "4":

end_time=1.5; break;

case "5":

end_time=2; break;

case "6":

end_time=2.5; break;

case "7":

end_time=3; break;

case "8":

end_time=3.5; break;

case "9":

end_time=4; break;

case "A":

end_time=4.5; break;

case "B":

end_time=5; break;

case "C":

end_time=5.5; break;

case "D":

end_time=6; break;

case "E":

end_time=6.5; break;

case "F":

end_time=7; break;

case "G":

end_time=7.5; break;

case "H":

end_time=8; break;

}

daily.add(end_time-start_time);

}

double normal;

double extra;

double pay=0;

double hours=0;

//matching to location

if(x>99&&x<200)

{

for(int y=0;y<daily.size();y++)

hours+=daily.get(y);

if(hours>30)

{

normal = 30;

extra = hours-30;

}

else

{

normal = hours;

extra = 0;

}

pay = 10*(normal + extra*1.5);

}

else if(x>199&&x<300)

{

for(int y=0;y<daily.size();y++)

hours+=daily.get(y);

if(hours>40)

{

normal = 40;

extra = hours-40;

}

else

{

normal = hours;

extra = 0;

}

pay = 7.5*(normal + extra*2);

}

else if(x>299&&x<400)

{

for(int y=0;y<daily.size();y++)

hours+=daily.get(y);

if(hours>20)

{

normal = 20;

extra = hours-20;

}

else

{

normal = hours;

extra = 0;

}

pay = 9.25*normal + 10.5*extra;

}

else if(x>399&&x<500)

{

for(int y=1;y<daily.size()-1;y++)

hours+=daily.get(y);

normal = hours;

extra = daily.get(0) + daily.get(6);

pay = 6.75*normal + 13.5*extra;

}

else

{

normal = 0;

extra = 0;

for(int y=0;y<daily.size();y++)

{

hours = daily.get(y);

if(hours > 6)

{

normal += 6;

extra += hours-6;

}

else

{

normal += hours;

}

}

pay = 8*normal + 12*extra;

}

System.out.printf("\n$%1.2f \n", pay);

System.out.println();

daily.clear();

}

}

}