from functools import reduce


def fn(x, y):
    return (x * 10 + y)


def char2num(s):
    return {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6,
            '7': 7, '8': 8, '9': 9}[s]


reduce(fn, map(char2num, '13579'))
s = input()
