xoy=list(input())
x=""
i=0
if xoy[i]=="-" or xoy[i]=="+":
    if xoy[i]=="-":
        x+="-"
    i+=1
#print(i)
while i<len(xoy) and xoy[i]!="+" and xoy[i]!="-":
    x+=xoy[i]
    i+=1
op=xoy[i]
y=""
i+=1
if xoy[i]=="-" or xoy[i]=="+":
    if xoy[i]=="-":
        y+="-"
    i+=1
#print(xoy)
while i<len(xoy):
    y+=xoy[i]
    i+=1
#rint (y)
x=int(x)
#rint (x)
y=int(y)
#rint(x+y)
if op=="-":
    print(x+y)
else:
    print (x-y)