import java.io.*;
import java.util.*;
import java.util.stream.*;

// 処理
class Process {
    private int[] C;

    Process(int[] C) {
        this.C = C;
    }

    int getResult() {
        int confiscationCriteria = IntStream.of(C).sum() / 10;
        
        int count = 0;
        for(var c : C) {
            if(c <= confiscationCriteria) {
                count++;
            }
        }

        return (30 * count);
    }
}

public class Main {
    public static void main(String[] args) throws IOException {
        var bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        var printWriter    = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));

        // 入力
        int N = Integer.parseInt(bufferedReader.readLine().trim());

        int[] C = Stream.of(bufferedReader.readLine().trim().split("[ ]+")).mapToInt(Integer::parseInt).toArray();

        // 出力
        printWriter.println((new Process(C)).getResult());

        bufferedReader.close();
        printWriter.close();
    }
}