from typing import cast


S = input()
T = S+S
ans = -10**20
for i in range(len(S)):
    U = T[i:len(S)+i]
    if not(U[0]=='+' or U[0]=='-' or U[-1]=='+' or U[-1]=='-'):
        try:
            exec("a = " + U)
            ans = max(a,ans)
        except Exception as e:
            pass
print(ans)