#include <iostream>
int main() {
    double a[110];
    double b=0;
    int n;
    std::cin>>n;
    for (int i = 0; i < n; i++) {
        std::cin>>a[i];
        b+=a[i];
    }
    b/=10;
    double ans=0;
    for (int i = 0; i < n; i++) {
        ans+=(a[i]<=b?30:0);
    }
    std::cout<<ans<<std::endl;
}