S=raw_input()
s=1
x=0
ind=0
if(S[0]=='-'):
    s=-1
    ind+=1
if(S[0]=='+'):
    ind+=1
while S[ind]!='-' and S[ind]!='+':
    x*=10
    x+=ord(S[ind])-ord('0')
    ind+=1
x*=s
if(S[ind]=='-'):
    s=+1
    ind+=1
if(S[ind]=='+'):
    s=-1
    ind+=1
if(S[ind]=='-'):
    s*=-1
    ind+=1
if(S[ind]=='+'):
    ind+=1
y=0
for c in S[ind::]:
    y*=10
    y+=ord(c)-ord('0')
print x+s*y