''' Purpose: prints total of integers from 1 to n for user-supplied n. 
'''

# get n
reply = input( 'Enter a number: ' )
n = int( reply )

# compute total of 1 to n

# We need to somehow come up with total
# This concept is called accumulation
total = 0 # this line is necessary because you cant add something to a value that does not exist.  we call total the accumulator.

for i in range( 1, n+1 ):   # remember the first argument in the range is the first element in the sequence, the second argument is one greater than the final element in the sequence
    total = total + i       # update the accumulation to include another value in the range sequence
    print( i, total)        # see that i successively takes on the values fronm 1 to n, also see that the total is an accumulation
print( total )

#for i in range( 1, n+1 ):
#   total = 0 + i  this will ensure that total just equals i every time
#   print( i, total)

# print total

#total = n * (n+1)//2 Gauss equation
#print( total )