n = int(input())
d = n * 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991
div, mod = divmod(d, 10**190)
print(div, ".", mod, sep="")