#include <stdio.h>

void main(void) {
	int candidacyNum = 0;
	scanf("%d",&candidacyNum);
	int votesList[candidacyNum];
	int total = 0;
	for(int i = 0 ; i < candidacyNum ; i++){
		scanf("%d",&votesList[i]);
		total += votesList[i];
	}
	total /= 10;
	int result = 0;
	for(int i = 0 ; i < candidacyNum ; i++){
		if(votesList[i] <= total){
			result += 30;
		}
	}
	printf("%d",result);
}