import math
import sys
def S(): return sys.stdin.readline().rstrip()
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int, sys.stdin.readline().rstrip().split())
def LI(): return list(map(int, sys.stdin.readline().rstrip().split()))
def LS(): return list(sys.stdin.readline().rstrip().split())

import re

s = S()
num = re.split('[*+]', s)
op = re.split('[0-9]+', s)
op = op[1:-1]

ans = int(num[0])
for i in range(len(op)):
    if op[i] == '*':
        ans += int(num[i+1])
    elif op[i] == '+':
        ans *= int(num[i+1])

print(ans)