//No.191 供託金 import java.util.*; import java.io.*; import static java.util.Arrays.*; import static java.lang.Math.*; public class No0191 { static final Scanner in = new Scanner(System.in); static final PrintWriter out = new PrintWriter(System.out,false); static void solve() { int n = in.nextInt(); int[] c = new int[n]; long sum = 0; for (int i=0; i<n; i++) { c[i] = in.nextInt(); sum += c[i]; } double x = (double)sum/10; int cnt = 0; for (int i=0; i<n; i++) { if (c[i] <= x) cnt++; } out.println(cnt*30); } public static void main(String[] args) { long start = System.currentTimeMillis(); solve(); out.flush(); long end = System.currentTimeMillis(); //trace(end-start + "ms"); in.close(); out.close(); } static void trace(Object... o) { System.out.println(deepToString(o));} }