class Bank:
    acbal=20000
    def deposit(self,dep):
        m = dep % 100
        if dep >= 100 and dep <= 50000 and m == 0:
            self.acbal += dep
            print(self.acbal)
        else:
            print("invalid")
    def withdraw(self,wt):
        n=wt%100
        if wt>=100 and n==0 and self.acbal>=wt:
            self.acbal -=wt
            print(self.acbal)
        else:
            print("invalid")

    def balanceenq(self,bal):
        print("current balance is",self.acbal)

    def viewoptions(self):
        print("1.deposit")
        print("2.withdraw")
        print("3.balance")
        print("0.Exit")

    def validate(self):
        count =0
        while count<3:
            pin = int(input("enter the pin"))
            if pin == 1234:
                obj.viewoptions()
                while True:
                    choice = int(input("Enter choice"))
                    if choice == 1:
                        dep = int(input("Enter amount"))
                        self.deposit(dep)
                        self.viewoptions()
                    elif choice == 2:
                        wt = int(input("enter withdraw amount"))

                        self.withdraw(wt)
                    elif choice == 3:
                        self.balanceenq(self.acbal)
                    elif choice==0:
                        break

                    else:
                        Print("Invalid choice")
                return



            else:
                print("invalid")
                count +=1
                if count < 3:
                    print(("reenter the pin"))
                else:
                    print("try again after some time")







obj=Bank()
obj.validate()