L=['','','']
i=0
f=0
o="+-"
for c in input():
	if c in o and f==1:i=1;f=2
	L[i]+=c
	if f==2:i=2
	if c not in o:f=1
a,b=int(L[0]),int(L[2])
print(a+b if L[1]=='-' else a-b)