#include <stdio.h>
int main(){
	int n, v, vote = 0, cnt = 0, i;
	int c[100];
	scanf("%d", &n);
	for(i=0; i<n; i++){
		scanf("%d", &v);
		c[i] = v;
		vote += v;
	}
	vote /= 10;
	while(n--)	if(c[n] <= vote)	cnt++;
	printf("%d\n", cnt*30);
	return 0;
}