#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,ref,ans=0;
    cin>>n;
    vector<int> c(n);
    for(int i=0;i<n;++i)cin>>c[i];
    ref=accumulate(c.begin(),c.end(),0)/10;
    for(int i=0;i<n;++i)if(c[i]<=ref)++ans;
    ans*=30;
    cout<<ans<<endl;
}