a = input("")
while a != "="
    if a=="+"
    elif a=="-":
    elif a=="/":
    elif a=="*":
if a=="=":
    pass

from sys import exit

print("Application started.")

def check(number):
    if "." in number:
        try:
            float(number)
            return True
        except:
            return False
   
    else:
        try:
            int(number)
            return True
        except:
            return False

q = ""
while True:
    while True:
        number = input()

        if number == "e":
            print("Finished")
            exit()

        elif check(number) == False:
            print("Please enter number or e for exit!")
            continue
       
        else:
            q += number
            break
       

    while True:
        operator = input()
       
        if operator == "e":
            print("Finished")
            exit()

        elif operator not in "+-*/=" and len(operator) != 1:
            print("Please enter valid operationor e for exit!")
            continue

        else:
            if operator == "=":
                result = eval(q)
               
                print(result)
                print("Finished")
                exit()

            else:
                q += operator
                break