#include <iostream> #include <vector> #include <string> #include <cstring> #include <algorithm> #include <sstream> #include <map> #include <set> using namespace std; #define REP(i,a,b) for(i=a;i<b;i++) #define rep(i,n) REP(i,0,n) typedef long long ll; typedef unsigned long long ull; typedef long double lb; /* ここからが本編 */ int main(void) { int i,j,k; int n; static int c[1000000]; ull sum = 0; double standard; int cnt = 0; cin >> n ; rep(i,n) { cin >> c[i]; sum += c[i]; } standard = (double)sum / 10; rep(i,n) { if(standard >= c[i]) cnt++; } cout << cnt*30 << endl; return 0; }