#include<bits/stdc++.h> using namespace std; using Int = long long; //INSERT ABOVE HERE signed main(){ Int n; cin>>n; vector<Int> c(n); for(Int i=0;i<n;i++) cin>>c[i]; Int s=accumulate(c.begin(),c.end(),0); Int ans=0; for(Int i=0;i<n;i++) ans+=c[i]*10<=s; cout<<ans*30<<endl; return 0; }