#!/usr/bin/env python3

value = input("数字を入力して: ")
value = int(value)
calc = input("計算方法(1: 総和, 2: 階乗): ")

if calc == "1" :
    sum = 0
    for i in range(1, value + 1):
        sum += i
    print("総和: " + str(sum))
elif calc == "2" :
    sum = 1
    for i in range(1, value + 1):
        sum *= i
    print("階乗: " + str(sum))