xopy = input()

for i in range(1, len(xopy) -1):
    if xopy[i] == "+" or xopy[i] == "-":
        break

x = int(xopy[:i])
y = int(xopy[i+1:])
op = xopy[i]

if op == "+":
    print(eval("x-y"))
else:
    print(eval("x+y"))