package main

import (
	"fmt"
	"math"
)

var (
	N int
	C []int
)

func ceil(f float64) int {
	return int(math.Ceil(f))
}

func resolve() int {
	ret := 0
	totalVotes := 0
	for i := 0; i < N; i++ {
		totalVotes += C[i]
	}
	borderLine := ceil(float64(totalVotes) / float64(10))
	for i := 0; i < N; i++ {
		if C[i] > borderLine {
			continue
		}
		ret += 1
	}
	return ret * 30
}

func main() {
	fmt.Scanf("%d\n", &N)
	C = make([]int, N)
	for i := 0; i < N; i++ {
		fmt.Scanf("%d,", &C[i])
	}
	fmt.Scanf("\n")
	fmt.Println(resolve())
}