import decimal as d
dec = d.Decimal
d.getcontext().prec = 1024

D = "0.1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991"
d = dec(D)
t = dec(input())
print(d*t)