s = input()
n = len(s)
ans = 0
for _ in range(n):
    if (
        ord("0") <= ord(s[0])
        and ord(s[0]) <= ord("9")
        and ord("0") <= ord(s[n - 1])
        and ord(s[n - 1]) <= ord("9")
    ):
        ans = max(ans, eval(s))
    s += s[0]
    s = s[1:]
    # print(s)
print(ans)
# print(eval("11+"))