eq = input()
n = len(eq)
flg = False
for i in range(n):
    if eq[i].isdigit():
        flg = True
    elif flg and eq[i] in "+-":
        ope = eq[i]
        break
    
x = int(eq[:i])
y = int(eq[i + 1:])
if ope == "+":
    print(x - y)
else:
    print(x + y)