John, Bruce and beer

John has some money. Bruce has some money too. They know price of a bottle of beer (unfortunately, beer is not free). How many bottles of beer can they buy, if they put together their money?

Input

The first row of input contains John’s amount of money. The second row contains Bruce’s amount of money. The third line contains the price of a bottle of beer. Each amount or price is represented by non-empty integer part, decimal point and exactly two digits after point. Each (John and Bruce’s) amount of money is non-negative and strictly less than 1000000.00. Beer is not free and costs strictly less than 1000.00.

Output

Your program should write exactly one integer: the maximal quantity of bottles guys can buy spending their money.

Examples