S=input()

if not(S[0]=="+" or S[0]=="-"):
    S="+"+S

try:
    a=float("inf")
    a=S[1:].index("+")
except:
    pass

try:
    b=float("inf")
    b=S[1:].index("-")
except:
    pass

if a<b:
    T=S[:a+1]+"-"+S[a+2:]
else:
    T=S[:b+1]+"+"+S[b+2:]

print(eval(T))