# Sum of Series
# 1 + 2 + 3 + 4 + 5 + 6 + .... + 10

sum = 0 
#try putting a comment symbol in the above line and observe the error produced
#what is the reason behind this error?

#Although we want sum of first 10 numbers, we will generalise and take the sum
#upto first n numbers.
#What is the largest value of n that will give a correct output?
#Ofcourse we can also find the sum by the formula sum = n(n+1)/2

n = int(input("Enter a number "))

for i in range(n + 1):
    sum = sum + i      

print("Sum of series is : ", sum)

#EOProgram