""" File:     exam_score.py
    Purpose:  Compute the exam score needed by a student to get a desired
              grade

    Run:      python exam_score.py

    Input:    Student's scores on all work except the final exam
              Student's desired final average
    Output:   Exam score needed to get desired final average

    Note:     This version uses a function to compute the weighted
              score on all the assignments prior to the final exam.
"""

#----------------------------------------------------------------------
def prior_to_exam(hwk, hwk_pct, p1, p2, p12_pct, p3, p4, p5, p345_pct,
      mt1, mt2, mt_pct):
   """Find the weighted score of a student's grades prior to the
   final exam.
   """
   to_date_avg = hwk_pct*hwk + p12_pct*(p1+p2) + p345_pct*(p3+p4+p5) + \
      mt_pct*(mt1+mt2)
   return to_date_avg

hwk_pct = 0.15
p12_pct = 0.06
p345_pct = 0.08
mt_pct = 0.12
exam_pct = 0.25

hwk_str = raw_input("Enter your homework average\n")
hwk = float(hwk_str)

p1 = float(raw_input("Enter your p1 score\n"))
p2 = float(raw_input("Enter your p2 score\n"))
p3 = float(raw_input("Enter your p3 score\n"))
p4 = float(raw_input("Enter your p4 score\n"))
p5 = float(raw_input("Enter your p5 score\n"))
mt1 = float(raw_input("Enter your mt1 score\n"))
mt2 = float(raw_input("Enter your mt2 score\n"))

print

avg = float(raw_input("Enter your desired final average\n"))

to_date_avg = prior_to_exam(hwk, hwk_pct, p1, p2, p12_pct, p3, p4, p5,
      p345_pct, mt1, mt2, mt_pct)
 
exam = (avg - to_date_avg)/exam_pct

print "Final exam score should be", exam