#include<stdio.h>
#include<string.h>
#include<stdlib.h>



int main(void){
int n,c[105];
int sum=0;
scanf("%d",&n);

for(int i=0;i<n;i++){
    scanf("%d",&c[i]);
    sum=sum+c[i];
}
sum=sum/10;
int yes=0;
for(int i=0;i<n;i++){
if(sum>=c[i]){yes++;}
}

printf("%d\n",yes*30);

}