using System;
using System.Collections.Generic;
using System.Collections;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.IO;
using System.Reflection;
using static System.Math;
using System.Numerics;
using nint=System.Int64;
static class Program{
	const int mod=(int)1e9+7;
	const double eps=1e-11;
	static void Main(){
		Sc sc=new Sc();
		var n=sc.I;
		var a=new (int,int)[n>>1];
		var b=new (int,int)[n-a.Length];
		for(int i = 0;i<n;i++) {
			var e=sc.Ia;
			if(i<a.Length){a[i]=(e[0],e[1]);}
			else{b[i-a.Length]=(e[0],e[1]);}
		}
		int m=1<<b.Length;
		var dp2=new long[m];
		for(int i = 0;i<b.Length;i++) {dp2[0]-=b[i].Item2;}
		for(int i = 1,j=0;i<m;i++) {
			if(1<<(j+1)==i){j++;}
			dp2[i]=dp2[i-(1<<j)]+b[j].Item2+b[j].Item1;
		}
		Array.Sort(dp2);
		m=1<<a.Length;
		var dp1=new long[m];
		for(int i = 0;i<a.Length;i++) {dp1[0]-=a[i].Item2;}
		long ans=long.MaxValue>>1;
		var p=dp2.Bs(-dp1[0],true);
		if(p>=0){ans=Min(ans,Abs(dp1[0]+dp2[p]));}
		if(p+1!=1<<b.Length){ans=Min(ans,Abs(dp1[0]+dp2[p+1]));}
		for(int i = 1,j=0;i<m;i++) {
			if(1<<(j+1)==i){j++;}
			dp1[i]=dp1[i-(1<<j)]+a[j].Item2+a[j].Item1;
			p=dp2.Bs(-dp1[i],true);
			if(p>=0){ans=Min(ans,Abs(dp1[i]+dp2[p]));}
			if(p+1!=1<<b.Length){ans=Min(ans,Abs(dp1[i]+dp2[p+1]));}
		}
		Console.WriteLine(ans);
	}
}
static class Ex1{
	public static int Bs(this nint[] a,nint x,bool b){return Bs2(a,x,b,a.Length);}
	public static int Bs(this nint[] a,nint x,bool b,int ub){return Bs2(a,x,b,ub+1);}
	private static int Bs2(nint[] a,nint x,bool b,int ub){
		int lb=-1,mid=0;
		while(ub-lb>1){
			mid=(ub+lb)/2;
			if(a[mid]>=x){ub=mid;}
			else{lb=mid;}
		}
		return b?lb:ub;
	}
}
public class Sc{
	public int I{get{return int.Parse(Console.ReadLine());}}
	public long L{get{return long.Parse(Console.ReadLine());}}
	public double D{get{return double.Parse(Console.ReadLine());}}
	public string S{get{return Console.ReadLine();}}
	public int[] Ia{get{return Array.ConvertAll(Console.ReadLine().Split(),int.Parse);}}
	public long[] La{get{return Array.ConvertAll(Console.ReadLine().Split(),long.Parse);}}
	public double[] Da{get{return Array.ConvertAll(Console.ReadLine().Split(),double.Parse);}}
	public string[] Sa{get{return Console.ReadLine().Split();}}
	public object[] Oa{get{return Console.ReadLine().Split();}}
	public int[] Ia2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),int.Parse);}}
	public int[] Ia3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),int.Parse);}
	public int[] Ia3(int a){return Array.ConvertAll((Console.ReadLine()+" "+a.ToString()).Split(),int.Parse);}
	public long[] La2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),long.Parse);}}
	public long[] La3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),long.Parse);}
	public long[] La3(int a){return Array.ConvertAll((Console.ReadLine()+" "+a.ToString()).Split(),long.Parse);}
	public double[] Da2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),double.Parse);}}
	public double[] Da3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),double.Parse);}
	public T[] Arr<T>(int n,Func<T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f();}return a;}
	public T[] Arr<T>(int n,Func<int,T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i);}return a;}
	public T[] Arr<T>(int n,Func<string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(Console.ReadLine().Split());}return a;}
	public T[] Arr<T>(int n,Func<int,string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i,Console.ReadLine().Split());}return a;}
}