x = int(input())
s = 0.0
k = 2
x_minus_1 = x - 1
while True:
    k_float = float(k)
    denominator = (k_float ** x_minus_1) * (k - 1)
    if denominator == 0:
        term = 0.0
    else:
        term = 1.0 / denominator
    if term < 1e-20:
        break
    s += term
    k += 1

result = s * 1e6
print(int(result))