s=raw_input()
a=[""]
e=[]
for c in s:
	if c.isdigit():
		a[-1]+=c
	else:
		a[-1]=int(a[-1])
		a+=[""]
		e+=[c]
a[-1]=int(a[-1])
b=a.pop(0)
for i in range(len(a)):
	if e[i]=="*":
		b+=a[i]
	else:
		b*=a[i]
print b