#include <iostream>
#include <vector>
#include <cstdio>
#include <sstream>
#include <map>
#include <string>
#include <algorithm>
#include <queue>
#include <cmath>

using namespace std;


//後ろからメモ化再帰
int dfs(vector<int> &D, vector<int> &dp, int &N, int state, int MAX_HP){
	if(dp[state] >= 0) return dp[state];

	
	//前の相手
	for(int j=0; j<N; j++){
		//戦っていない相手
		if( (state & (1<<j)) == 0) continue;

		//ひとつ前の状態
		int before_state = ( state & ( ~(1<<j) ) );
		
		//ひとつ前の状態の最大体力
		int before_HP = MAX_HP - (D[j]<0?1:0);
		
		if(before_HP <= 0) continue;

		int tmp = dfs(D,dp,N, before_state, before_HP);
		if(tmp <= 0) continue;
		
		dp[state] = min( max( dp[state] , tmp + D[j]), MAX_HP*100);
	}

	dp[state] = max(dp[state], 0);

	return dp[state];

}


int main(){
	int N;
	cin >> N;
	vector<int> D(N);
	int max_HP=1;
	for(int i=0; i<N; i++){
		cin >> D[i];
		if(D[i] < 0) max_HP++;
	}
	vector<int> dp(1<<N, -1);
	dp[0] = 100;
	int ans = max(0, dfs(D,dp,N, (1<<N)-1, max_HP));
	cout << ans << endl;
	return 0;
}