import re
s=input()
op=[]
for i in range(len(s)):
  if s[i]=='*':
    op.append(0)
  elif s[i]=='+':
    op.append(1)
s2=re.split('[+*]',s)
ans=int(s2[0])
for i in range(1,len(s2)):
  if op[i-1]==0:
    ans+=int(s2[i])
  else:
    ans*=int(s2[i])
print(ans)