#A treasure box has a 4-digit combination lock. The box opens when you enter the 
#following value: (sum of middle digits)*(average of first and last digit). Write a 
#program that reads one 4-digit number, combination lock, and finds the number that 
#opens the box.  

#Example: 1234
#(2+3)*((1+4)/2))=5*2.5=12.5

#Part 1 Input:
num=int(input("enter integer between 1000 and 9999: "))
#Part 2 Calculation:
#Let's call digits d1, d2, d3, d4 where d1 is first digit and d4 is last digit
save_num = num #saving an original value
#Example num=1234
d4 = num%10 		#d4=1234%10=4
num = num//10 		#num=1234//10=123
d3 = num%10		#d3=123%10=3
num = num//10		#num=123//10=12
d2= num%10		#d2=12%10=2
num = num//10		#num=12/10=1
d1= num%10		#d1=1%10=1

open_box_combo=(d3+d2)*((d1+d4)/2)
#Output
print("the number that opens the box is", open_box_combo)