import scipy.special
x = int(input())
ans = 0
l = [0]
for i in range(2, 10000):
    cur = scipy.special.zeta(i) - 1
    ans += cur
    l.append(l[-1] + cur)
if x == 2:
    print(1000000)
else:   
    print(int((ans - l[x - 2]) * 10 ** 6))