S=input()
if S[0]=="+":
    S=S[1:]
if "++" in S:
    a,b=S.split("++")
    print(int(a)-int(b))
elif "-+" in S:
    a,b=S.split("-+")
    print(int(a)+int(b))
elif "+" in S:
    a,b=S.split("+")
    print(int(a)-int(b))
elif "--" in S:
    a,b=S.split("--")
    print(int(a)-int(b))
elif S[0]=="-":
    a,b=S[1:].split("-")
    print(int(-a)+int(b))


else:
    a,b=S.split("-")
    print(int(a)+int(b))