import sys
input=lambda: sys.stdin.readline().rstrip()
S=input()
ans=0
cal="*"
cur=""
for s in S:
  if s=="*" or s=="+":
    if cal=="*":
      ans+=int(cur)
    else:
      ans*=int(cur)
    cal=s
    cur=""
  else:
    cur+=s
else:
  if cal=="*":
    ans+=int(cur)
  else:
    ans*=int(cur)
print(ans)