import re
inp = raw_input()

if inp[0] == '-':
    x_minus = True
    inp = inp[1:]
elif inp[0] == '+':
    x_minus = False
    inp = inp[1:]
else:
    x_minus = False

x = re.findall('^(\d*)[^\d*]', inp)
x = x[0]
inp = inp[len(x):]
x = int(x)

if x_minus == True:
    x = -x


op = inp[0]
inp = inp[1:]


if inp[0] == '-':
    y_minus = True
    inp = inp[1:]
elif inp[0] == '+':
    inp = inp[1:]
    y_minus = False
else:
    y_minus = False

y = int(inp)

if y_minus == True:
    y = -y
    

if op == '+':
    ans = x-y
else:
    ans = x+y

print ans