S = raw_input()
key = [S[i] for i in range(len(S)) if S[i] == '*' or S[i] == '+']
nums = map(int,S.replace('*',' ').replace('+',' ').split())
ans = nums[0]
for i in range(1,len(nums)):
	if key[i - 1] == '*':
		ans += nums[i]
	elif key[i - 1] == '+':
		ans *= nums[i]
print ans