xopy = input()
L = list(xopy)
for i in range(len(L)):
    if L[i].isnumeric() == True and L[i+1].isnumeric() == False:
        xl = L[0:i+1]
        ops = L[i+1]
        yl = L[i+2:len(L)]
        break
xs = ""
for i in range(len(xl)):
    xs += xl[i]
ys = ""
for i in range(len(yl)):
    ys += yl[i]

x = int(xs)
y = int(ys)

if ops == '+':
    print(x - y)
if ops == '-':
    print(x + y)