package main

import (
	"fmt"
	"io"
	"os"
)

func main() {
	solve(os.Stdin, os.Stdout, os.Stderr)
}

func solve(in io.Reader, out io.Writer, err io.Writer) {
	var number int
	fmt.Fscan(in, &number)
	var sum int
	var vote [102]int

	for i := 0; i < number; i++ {
		fmt.Fscan(in, &vote[i])
		sum += vote[i]
	}

	threshold := int(float64(sum) / 10.0)

	var count int
	for i := 0; i < number; i++ {
		if vote[i] <= threshold {
			count++
		}
	}
	fmt.Fprintln(out, count*30)
}