import sys
def I(): return int(sys.stdin.readline().rstrip())


x = I()
if x == 2:
    print(10**6)
    exit()

ans = 0
for i in range(2,10000):
    if pow(i,x-1) <= 10**12:
        ans += (1/(i**(x-1)))/(i-1)
    else:
        break

print(int(ans*10**6))