xopy = list(input())
for i in range(len(xopy)):
    if 48 <= ord(xopy[i]) <= 57 and (xopy[i+1] == '+' or xopy[i+1] == '-'):
        if xopy[i+1] == '+':
            xopy[i+1] = '-'
        else:
            xopy[i+1] = '+'
        break
print(eval(''.join(xopy)))