package main

import . "fmt"

func main() {
	var n,t int
	Scan(&n)
	c:=make([]int,n)
	for i:=range c {
		Scan(&c[i])
		t+=c[i]
	}
	for _,v:=range c {
		if t<=v*10 {
			n--
		}
	}
	Println(n*30)
}