import * as fs from 'fs'

const main = () => {
  const input = fs.readFileSync('/dev/stdin', 'utf8').split('\n')

  const [n] = input[0].split(' ').map((x: string): number => +x)
  const d = input[1].split(' ').map((x: string): number => +x)
  const [x, y] = input[2].split(' ').map((x: string) => +x)

  const targetDistance = Math.abs(x) + Math.abs(y)
  let incrementAcc = 0
  let decrementAcc = 0

  for (let i = 0, len = n; i < len; i++) {
    if (targetDistance === 0) {
      return console.log(0)
    }

    if (d[i] === targetDistance) {
      return console.log(1)
    }

    if (incrementAcc === targetDistance) {
      return console.log(2)
    }

    if (decrementAcc === targetDistance) {
      return console.log(2)
    }

    incrementAcc += d[i]
    decrementAcc -= d[i]
  }

  return console.log(-1)
}

main()