def getExamPoints (student, count)
	
	points = 0.0
	
	for i in range (1, count + 1):
		score = input("Enter " + student +"'s score for exam " + str(i) )
		points == points + score
	
	examPercent = (points / (count * 200) ) * 50
	
	return examPercent
	

def getHomeworkPoints (student, count):
	
	points = 0.0
	
	for i in range (1, count + 1):
		score = input("Enter " + student +"'s score for homework " + str(i) )
		points = points + score
	
	homeworkPercent = points / count
	
	return homeworkPercent

	
def getProjectPoints (student, count):
	
	points = 0.0
	
	for i in range (1, count + 1):
		score = input("Enter " + student +"'s score for project " + str(i) )
		points = points + score
	
	projectPercent = (points  * 40/ (count * 100)) 
	

	
def computeGrade ( score ):
	
	if grade < 60:
		grade = "F"
	elif grade < 70:
		grade = "D"
	elif grade < 80:
		grade = "C"
	elif grade < 90:
		grade = "B"
	else:
		grade = "A"	
		
	return grade


def computeClassGrades ( classGrade ):

	classTotal = 0.0
	studentcount = 0
        
	studentName = raw_input ("Enter the next student's name, 'quit' when done")
        
	while studentName != "quit":
        
		studentCount = studentCount + 1
            
		examPoints = getExamPoints( studentName, 4)
		homeworkPoints = getHomeworkPoints ( studentName, 5 )
		projectPoints = getProjectPoints ( studentName, 3 )
		
		studentScore = examPoints + homeworkPoints + projectPoints
		
		classTotal = classTotal + studentScore     
		
		studentGrade = computeGrade (studentScore)
		
            	print studentName, ":\t", studentScore, "\t", studentGrade 
            
            	studentName = input ("Enter the next student's name, 'quit' when done")
       
       	return classTotal / studentCount	# return the average


def main ( ):

	classAverage = 0.0		
	classAvgGrade = "C"
        
	# print column headers
    
	print "Student\tScore\tGrade\n" 
        
	classAverage =  computeClassGrades ( )
        
	# round class average
        
	classAverage = int ( round(classAverage ))
        
	classAvgGrade = computeGrade ( classAverage )
        
	print  "Average class score: " , classAverage, "\nAverage class grade: ", classAvgGrade 
	        
main ( ) # end of main