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Acres

Time limit1sMemory limit1024 MB

Summary
Given the yard dimensions of a rectangular field, compute how many 5-acre seed bags are needed to plant all of it.
Level

Easy1 of 10

Topics
Math, Implementation
Solved
No attempts yet

Problem

You have a rectangular field you want to plant with corn. You know the dimensions of the field in yards, and you know that one bag of corn seed will cover 5 acres. You also know that 4840 square yards is equal to 1 acre. Given the dimensions of the rectangular field in yards, compute the number of bags of corn seed you need to plant the entire field.

Input

The first line contains two positive integers that are the dimensions of the rectangular field in yards.

Output

A positive integer that is the number of bags of corn seed needed to plant the entire field.

Examples2

  1. Example 1

    Input
    100 1000
    
    Expected output
    5
    
  2. Example 2

    Input
    200 10500
    
    Expected output
    87