소스 코드 제출

#

# stack=[]

# arr=list(input().split())

# sum=0

# top=-1

# while True:

# stack.append(arr[sum])

# top+=1

# if stack[top]=='+':

# stack.pop()

# top-=2

# a=int(stack.pop())

# b=int(stack.pop())

# stack.append(a+b)

# elif stack[top]=='-':

# stack.pop()

# top-=2

# a=int(stack.pop())

# b=int(stack.pop())

# stack.append(b-a)

# elif stack[top]=='*':

# stack.pop()

# top-=2

# a=int(stack.pop())

# b=int(stack.pop())

# stack.append(a*b)

#

# sum += 1

#

# if len(arr)==sum:

# break

# print(stack[0])

arr=list(input().split())