def pifor(n):
	piover4=0
	sign = 1
	for x in range(1,2*n,2):
		piover4 = piover4 + sign/x
		sign = -1 * sign
		print(4*piover4)
	return 4*piover4

def main():
        n = eval(input("請問您想要使用Leibniz公式計算pi到第幾項? 請輸入正整數 "))
        print("使用Leibnez公式計算pi到第 ", n, "項等於 ", pifor(n))

main()

def piwhile(n):
        piover4old=0
        piover4=1
        x=3
        sign=-1
        while int(4*piover4*10**n)!=int(4*piover4old*10**n):
             piover4old = piover4
             piover4 = piover4 + sign/x
             sign = -1 * sign
             x = x + 2
        return [x//2, 4*piover4old, 4*piover4]

def main1():
        n = eval(input("請問您想計算pi精準到小數點以後第幾位? 請輸入正整數 "))
        L=piwhile(n)
        print("計算到第 ", L[0], "和 ", L[0]+1, "項時得到兩個趨近pi之值為 ", L[1], L[2])


main1()