简单计算

package main

import "fmt"

func main() {
	// 20L == 20 dm^3 20 000 c^3
	var maxnn float64 = 20000
	var h, r float64 = 0.0, 0.0
	pi := 3.14
	fmt.Scan(&h, &r)
	v := h * r * r * pi
	ans := int(maxnn/v) + 1
	fmt.Printf("%d", ans)
}