#include<stdio.h>

int main(void){
  int i;
  int N, C[100];
  int n = 0, sum = 0;
  scanf("%d", &N);
  for(i = 0; i < N; i++){
    scanf("%d", &C[i]);
    sum += C[i];
  }
  for(i = 0; i < N; i++){
    if(C[i] <= sum / 10) n++;
  }
  printf("%d\n", n * 30);
  return 0;
}