#write a program that reads 7 real numbers. Each number indicates the 
#Fahrenheit 
#temperature for one day. The program finds and prints the average Celsius 
#temperature for these 7 days.
#Use the following formula to convert Fahrenheit to Celsius:
#Celsius = (5/9)*(Fahrenheit-32) 

i = 0
sum = 0 
while(i<7):
	F=float(input("enter Fahrenheit "))
	C = (5/9)*(F-32)
	sum=sum+C
	i=i+1

ave=sum/7

print("average Celsius", ave)