// yukicoder: No.191 供託金
// 2019.4.13 bal4u

#include <stdio.h>

//// 高速入力
#if 1
#define gc() getchar_unlocked()
#else
#define gc() getchar()
#endif
int in()    // 非負整数の入力
{
	int n = 0, c = gc();
	do n = 10 * n + (c & 0xf), c = gc(); while (c >= '0');
	return n;
}

int c[102]; int N;

int main()
{
	int i, s, ans;

	N = in();
	s = 0;  for (i = 0; i < N; i++) {
		c[i] = in();
		s += c[i];
	}
	ans = 0; for (i = 0; i < N; i++) {
		if (10 * c[i] <= s) ans++;
	}
	printf("%d\n", ans*30);
	return 0;
}