import java.util.Scanner; public class Kyotaku{ public static void main(String arg[]){ int n,sum=0,res=0; Scanner sc = new Scanner(System.in); n = sc.nextInt(); int[] c = new int[n]; for(int i = 0;i<n;i++){ c[i] = sc.nextInt(); sum = sum + c[i]; } for(int i = 0;i<n;i++){ if(sum == 0){ res = n*30; break; } if((double)c[i] / (double)sum <= 0.1)res = res + 30; } System.out.println(res); } }