#include <stdio.h>

int main(void) {
	int k = 0,i,n,d=0,p[128];
	scanf("%d",&n);
	for(i = 1;i <= n;i++){
		scanf("%d",&p[i]);d+=p[i];
	}
	d = d / 10;
	for(i = 1;i <= n;i++){
		if(d >= p[i]){k++;}
	}
	printf("%d\n",k*30);
	return 0;
}