S = raw_input()
N = len(S)
def solve(h):
	for i in xrange(h,-1,-1):
		if S[i] == '+':
			return solve(i-1)*int(S[i+1:h+1])
		elif S[i] == '*':
			return solve(i-1)+int(S[i+1:h+1])
	else:
		return int(S[0:h+1])
print solve(N-1)