#Write a program that reads a positive integer. The program finds and 
#prints the sum of all divisors of the input number. 

#example: n=12, n%1=12%1=0, 1 is a divisor of 12
#12%2=0, 2 is a divisor of 12
#12%3=0, 3 is a divisor of 12
#12%4=0, 4 is a divisor of 12
#12%5=2, 5 is NOT a divisor of 12
#12%6=0, 6 is a divisor
#12%7=5, 7 is NOT a divisor of 12
#12%8=4, 8 is NOT a divisor of 12
#12%9=3, 9 is NOT a divisor of 12
#12%10=2, 10 is NOT a divisor of 12
#12%11=1, 11 is NOT a divisor of 12
#12%12=0, 12 is a divisor of 12

n=int(input("enter positive integer "))
if(n>0):
	i=1 #in this example we must start from 1 to avoid division by 0
	sum=0
	while(i<=n):
		if(n%i==0):
			print(i,"is a divisor of",n)
			sum=sum+i
		i=i+1
	print("sum=",sum)
else:
	print("invalid input")