#!/usr/bin/python

def sum_seq (n):
    result = 0
    for i in range (n+1):
        result += i
        print(i)
    return result

def gauss_f (n):
    halve = n / 2
    print(halve)
    result = int (n * halve + halve)
    return result

try:
    user_input = input() or "100"
    user_input = int (user_input )
except:
    print ("wrong input")
    print ("Result set to default")
    user_input = 100
finally:
    calc1 = sum_seq(user_input)
    calc2 = gauss_f(user_input)
    print ("sum Sequence from 0 to n")
    print("Result\n")
    print (f"your input = {user_input}")
    print (f"forloop result {calc1=}")
    print (f"Karl gauss result {calc2=}")