Dance Hall

package main

import "fmt"

func main() {
    var l, w, a float64
    fmt.Scanln(&l)
    fmt.Scanln(&w)
    fmt.Scanln(&a)

    space := l * w - (l * w / 10) - a * a

    dancers := int(space / 0.7040)

    fmt.Println(dancers)
}