s = input()
if s.startswith('-'):
    sign1 = -1
    s = s[1:]
elif s.startswith('+'):
    sign1 = 1
    s = s[1:]
else:
    sign1 = 1
for i, c in enumerate(s):
    if c == '+':
        sign2 = -1
        num1 = int(s[:i])
        s = s[i+1:]
        break
    elif c == '-':
        sign2 = 1
        num1 = int(s[:i])
        s = s[i+1:]
        break
if s.startswith('-'):
    sign2 *= -1
    s = s[1:]
elif s.startswith('+'):
    s = s[1:]
num2 = int(s)
print(sign1 * num1 + sign2 * num2)