#!/usr/bin/python3
# -*- coding: utf-8 -*-

# Left must be a variable, right an arithmetic expression.
# Arithmetic operators: +, -, *, /, %

# An assignment statement’s right side can be an arithmetic expression:
# Ex: x = (3 * y) + (z / 2).
# This over-simplified program below computes the total cost of a loan,
# given the loan amount and interest.

loan_amount: float = float(input())
interest_rate: float = float(input())
total_cost: float = loan_amount + (loan_amount * interest_rate)
print(total_cost)