S = str(input())
s = 0
p = 0
for k in range(1,len(S)):
    if S[k] == "+":
        p = k
        s = -1
        break
    elif S[k] == "-":
        p = k
        s = 1
        break
x = S[:k]
y = S[k+1:]

if x[0] == "-":
    X = -int(x[1:])
elif x[0] == "+":
    X = int(x[1:])
else:
    X = int(x)

if y[0] == "-":
    Y = -int(y[1:])
elif x[0] == "+":
    Y = int(y[1:])
else:
    Y = int(y)

print(X+s*Y)