import std.algorithm, std.array, std.container, std.range, std.bitmanip;
import std.numeric, std.math, std.bigint, std.random;
import std.string, std.conv, std.stdio, std.typecons;

const auto days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

void main()
{
  auto n = readln.chomp.to!int;
  auto ci = readln.split.map!(to!int);

  auto sum = ci.sum;

  bool calc(int c) {
    return c * 10 <= sum;
  }

  writeln(ci.count!(calc) * 30);
}