#include<stdio.h>
int main(void){
  int n;
  scanf("%d",&n);
  int c[n];
  int sum=0;
  int i;
  int henkan = 0;
  double border=0;
  for(i=0;i<n;i++){
    scanf("%d",&c[i]);
    sum+=c[i];
  }
  border = (double)sum/10;
  for(i=0;i<n;i++){
    if(border >= c[i] ){
      henkan+=30;
    }
  }
  printf("%d\n",henkan);
  return 0;
}