import math

x = int(input())

if x == 2:
    print(1000000)
elif x == 3:
    s = 2.0 - (math.pi ** 2) / 6.0
    res = int(s * 1e6)
    print(res)
else:
    sum_total = 0.0
    k = 2
    eps = 1e-20  # Extremely small epsilon to ensure precision
    while True:
        term = 1.0 / ((k - 1) * (k ** (x - 1)))
        if term < eps:
            break
        sum_total += term
        k += 1
    res = int(sum_total * 1e6)
    print(res)