#include <stdio.h>

int main(void) {
	// your code goes here
	int n, c[100], i, total = 0, count = 0;
	fscanf(stdin, "%d", &n);
	for(i = 0; i < n; i++)
		fscanf(stdin, "%d", &c[i]);
	
	for(i = 0; i < n; i++)
		total += c[i];
		
	total = total / 10;
	
	for(i = 0; i < n; i++){
		if(c[i] <= total)
			count++;
	}
	
	printf("%d\n", count * 30);
	
	return 0;
}