s=input()
s+="+"
out,t=0,-1
for i in range(len(s)):
	if s[i]=='*' or s[i]=='+':
		a=s[t+1:i]
		if t==-1:out=int(a)
		else:
			if s[t]=='+':out*=int(a)
			if s[t]=='*':out+=int(a)
		t=i
print(out)