package main

import (
	"fmt"
)

func main() {
	var n int
	fmt.Scan(&n)
	var a int
	count := 0
	lenth := 0
	for i := 0; i < n; i++ {
		fmt.Scan(&a)
		if lenth == 2 {
			if a == 0 {
				count++
			}
			lenth = 0
		}
		if a == 0 {
			lenth++
		}
	}
	var x int
	fmt.Scan(&x)
	if count >= x {
		fmt.Print("true")
	} else {
		fmt.Print("false")
	}
}