succeed = False
fileName = None
fileContent = None

while not succeed:
	try:
		fileName = input("Enter a file name: ")
		fileContent = open(fileName, "r")
		succeed = True
	except OSError:
		print("Could not open", fileName)
		succeed = False

totalGrades = 0
totalScore = 0

for ln in fileContent:
	splittedStr = ln.split()
	totalScore = totalScore + int(splittedStr[2])
	totalGrades = totalGrades + 1

print("The average score is:", str(round(totalScore / totalGrades, 1)))