''' 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

# this is called an accumulator
# it starts at zero because we haven't added anything yet
total = 0

for number in range( 0, n+1 ):
    # total = 0; we have to set the accumulator before the loop
    # or it makes total equal to the last number
    total = total + number
    print(number, total)

print()

# print total
print( total )