x = int(input())
if x == 2:
    print(1000000)
else:
    total = 0.0
    k = 2
    eps = 1e-20  # Adjust this if necessary
    while True:
        denom = (k ** (x - 1)) * (k - 1)
        if denom == float('inf'):
            break
        term = 1.0 / denom
        if term < eps:
            break
        total += term
        k += 1
    result = total * 1e6
    print(int(result))