#include <stdio.h>

int main(void){
	int i,n;
	int cnt = 0;
	int sum = 0;
	int c[110];
	
	scanf("%d", &n);
	for(i=0;i<n;i++){
		scanf("%d", &c[i]);
		sum += c[i];
	}
	
	sum /= 10;
	
	for(i=0;i<n;i++){
		if(c[i] <= sum){
			cnt++;
		}
	}
	
	printf("%d\n", (cnt*30));
	return 0;
}