// No.191 供託金
package main

import "fmt"

func main() {
	var n int //出馬人数
	fmt.Scan(&n)

	c := make([]int, n)
	for i := 0; i < n; i++ {
		fmt.Scan(&c[i])
	}

	sum := 0
	for _, c1 := range c {
		sum += c1
	}

	ans := 0
	for _, c2 := range c {
		if c2 <= (sum / 10) {
			ans++
		}
	}
	fmt.Println(int(ans * 30))
}