a=input()
n=len(a)
s=""
j=0
for i in range(1,n):
    if a[i]=="+" or a[i]=="-":
       s=s+a[j:i]+a[i]
       j=i+1
s=s+a[j:n]       
print(eval(s))

/**************************************************************
	Problem: 1124
	User: admin
	Language: Python
	Result: Accepted
	Time:149 ms
	Memory:34480 kb
****************************************************************/