n = int(input()) - 1
l = n//36
s = ['12', '13', '14', '15', '16', '17', '18', '19', '23', '24', '25', '26', '27', '28', '29', '34', '35', '36', '37', '38', '39', '45', '46', '47', '48', '49', '56', '57', '58', '59', '67', '68', '69', '78', '79', '89'][n%36]
print(s + s[2]*l)