[백준] 1712번 : 손익분기점 - Javascript(자바스크립트)

https://www.acmicpc.net/problem/1712

const fs=require('fs')
let input=fs.readFileSync('/dev/stdin').toString().split(' ')
var a=parseInt(input[0])
var b=parseInt(input[1])
var c=parseInt(input[2])
var n=c-b

if(n<=0) console.log(-1)
else console.log(Math.floor(a/n)+1)