D = 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991
X = 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

n = int(input())
DN = D * n
a, b = int(DN / X), DN % X
b = ("0" * (190 - len(str(b)))) + str(b)

print("{0}.{1}".format(a, b))