using namespace std;
#include <bits/stdc++.h>
#define _ ios_base::sync_with_stdio(0);cin.tie(0);
#define __ return EXIT_SUCCESS;
#define FOR(I,A,B) for(int (I)=(A);(I)<(B);++(I))
int main()
{
	_
	int N;cin>>N;
	vector<int>C(N);int S=0;
	FOR(i,0,N){cin>>C[i];S+=C[i];}
	S/=10;
	int M=0;
	FOR(i,0,N){if(C[i]<=S)M++;}
	cout<<(M*30)<<endl;
	__
}