from decimal import Decimal
#引入decimal模块是因为python不是默认高精浮点数

def main():
    print('==Exercise 5==')
    
    flag=True
    while flag:
        a = input("number1=")
        try: 
            a = Decimal(a)
            flag=False
        except :
            print("pls input a number!")
    flag=True
    while flag:
        b = input("number2=")
        try: 
            b = Decimal(b)
            flag=False
        except :
            print("pls input a number!")

    print(f"The result is {a+b if a*b>Decimal(1000.0) else a*b}")

    print('==End Of Ex5==')
    return 0

if __name__ == '__main__':
    main()