import os
os.system("clear")
def position(x,y):
	pos=0
	ps=len(x)+1
	for i in x:
		if i==y:
			return(pos)
			break
		pos+=1
	return(ps)
def posi(x):
	tr=[]
	c=0
	for i in x:
		if((i=='*') or (i=='+') or (i=='/') or (i=='-') or (i=='^')):
			tr.append(c)
		c+=1
	return(tr)
def posio(x):
	tr=[]
	c=0
	for i in x:
		if((i=='(')):
			tr.append(c)
		c+=1
	return(tr)
def posic(x):
	tr=[]
	c=0
	for i in x:
		if((i==')')):
			tr.append(c)
		c+=1
	return(tr)
def calculate(x,y):
	p1=position(x,y)
	k1=int(x[p1-1])
	k2=int(x[p1+1])
	if y=='*':
		x.insert(p1-1,k1*k2)
	elif y=='/':
		x.insert(p1-1,k1/k2)
	elif y=='+':
		x.insert(p1-1,k1+k2)
	elif y=='-':
		x.insert(p1-1,k1-k2)
	elif y=='^':
		x.insert(p1-1,k1**k2)
	del x[p1]
	del x[p1]
	del x[p1]
def calculator(b):
	if b[len(b)-1]=='=':
		kj=0
		a=[]
		while kj<(len(b)-1):
			a.append(b[kj])
			kj+=1
	else:
		a=b

	if len(a)!=1:
		kr=posi(a)
		damage=0
		c=1
		while c<len(kr):
			if kr[c]-kr[c-1]==1:
				damage=1
			c+=1
		if damage==0:
			bs=[]
			c=1
			bs.append(a[:kr[0]])
			bs.append(a[kr[0]])
			while c<len(kr):
				bs.append(a[(kr[c-1]+1):kr[c]])
				bs.append(a[kr[c]])
				c+=1
			bs.append(a[(kr[c-1]+1):])
			cr=[]
			c=0
			while (c<len(bs)):
				ln=''
				for i in bs[c]:
					ln=ln+i
				c+=1
				cr.append(ln)
			a=cr
			i=1
			while len(a)!=1:
				if('^' in a):
					calculate(a,'^')
				elif ('*' in a) and ('/' in a):
					p1=position(a,'*')
					p2=position(a,'/')
					if p1<p2:
						calculate(a,'*')
					else:
						calculate(a,'/')
				elif ('*' in a):
					calculate(a,'*')
				elif ('/'in a):
					calculate(a,'/')
				elif ('+' in a) and ('-' in a):
					p1=position(a,'+')
					p2=position(a,'-')
					if p1<p2:
						calculate(a,'+')
					else:
						calculate(a,'-')
				elif ('+' in a):
					calculate(a,'+')
				elif ('-' in a):
					calculate(a,'-')

			return(a[0])
		else:
			print("Invalid input")
	else:
		return a[0]
def fpos(x,y):
	c=0
	pos=-1
	for i in x:
		if i==y:
			pos=c
			break
		c+=1
	return(pos)
def lpos(x,y):
	c=0
	pos=-1
	for i in x:
		if i==y:
			pos=c
		c+=1
	return(pos)
user_input=input()
if user_input.count("=")>1:
	print("Invalid Input")
	exit()
	input()
	os.system("clear")
kol=position(user_input,"=")
if "=" in user_input:
	if kol!=len(user_input)-1:
		print("Invalid Input")
		exit()
		input()
		os.system("clear")
yosh="!@#$%&_|}{\":?><QWERTYUIOPASDFGHJKLZXCVBNM[]\;'.,qwertyuiopasdfghjklzxcvbnm"
for i in yosh:
	if i in user_input:
		print("Invalid Input")
		exit()
		input()
		os.system("clear")
ocount=user_input.count("(")
ccount=user_input.count(")")
new_user_input=[]
for i in user_input:
	new_user_input.append(i)
danger=0
copy_new_user_input=new_user_input.copy()
if ocount==ccount:
	positions_of_openparanthesis=posio(copy_new_user_input)
	positions_of_closeparanthesis=posic(copy_new_user_input)
	abc=len(positions_of_openparanthesis)
	j=0
	while j<abc:
		i=1
		while i<len(copy_new_user_input) and len(positions_of_openparanthesis):
				if positions_of_openparanthesis[len(positions_of_openparanthesis)-1]+i in positions_of_closeparanthesis:
					del positions_of_openparanthesis[len(positions_of_openparanthesis)-1]
				i+=1
		j+=1
	if len(positions_of_openparanthesis)!=0:
		danger=1

else:
	danger=1
if danger==0:
	while copy_new_user_input.count("("):
		positions_of_openparanthesis=posio(copy_new_user_input)
		positions_of_closeparanthesis=posic(copy_new_user_input)
		j=0
		while j<abc:
			i=1
			kos=len(positions_of_openparanthesis)
			while i<len(copy_new_user_input) and kos:
					if positions_of_openparanthesis[len(positions_of_openparanthesis)-1]+i in positions_of_closeparanthesis:
						fi=positions_of_openparanthesis[len(positions_of_openparanthesis)-1]
						la=positions_of_openparanthesis[len(positions_of_openparanthesis)-1]+i
						pain=calculator(copy_new_user_input[fi+1:la])
						copy_new_user_input.insert(fi,str(pain))
						del copy_new_user_input[fi+1:la+2]
						positions_of_openparanthesis=posio(copy_new_user_input)
						positions_of_closeparanthesis=posic(copy_new_user_input)
						kos=0
					i+=1
			j+=1
	result=calculator(copy_new_user_input)
	print(result)
else:
	print("invalid input")

input()
os.system("clear")