#include <stdio.h> int main(void){ int i,n; int cnt = 0; int sum = 0; int c[110]; scanf("%d", &n); for(i=0;i<n;i++){ scanf("%d", &c[i]); sum += c[i]; } sum /= 10; for(i=0;i<n;i++){ if(c[i] <= sum){ cnt++; } } printf("%d\n", (cnt*30)); return 0; }