D = '1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991'
S = 190
N = int(input())
A = str(int(D) * N)
L = len(A) - len(D)
A = A[0:L] + '.' + A[L::]
if A.index('.') == 0:
	A = '0' + A
print(A)