import java.io.IOException;
import java.io.InputStream;
import java.util.NoSuchElementException;
 
public class Main {
    public static void main(String[] args)throws Exception{
        FastScanner sc = new FastScanner();
        int n = sc.nextInt();
        int a[] = new int[n]; 
        int b[] = new int[n]; 
        for(int i = 0 ; i< n ; i++) {
        	a[i] = sc.nextInt();
        	b[i] = sc.nextInt();
        }
        long min = 160000000000L;
        long ans = 0;
        long asum = 0;
        long bsum = 0;
        int cou = 0;
        boolean ch = false;
        boolean[] tf = new boolean[n];
        for(long i= 0 ; i < Math.pow(2.0,(double)n); i++) {
        	for(int j = 0 ; j< n ; j++) {
        		if(tf[j]) asum += a[j];
        		else bsum += b[j];
        	}
        	for(int k = 0 ;!ch && k < n ; k++)
        	{
        		if(!tf[k]) {
        			//System.out.println("とおった");
        			tf[k] = true;
        			break;
        		}
        		else
        		{
        			tf[k] = false;
        			for(int m = k+1 ; ;m++) {
        			//	System.out.println(i+""+k+""+m);
        				if(tf[m]= false) {
        					tf[m] = true;
        					ch= true;
        					break;
        				}
        				else 
        				{
        					tf[m] = false;
        				}
        			}
        			
        		}
        		break;
        	}
        	ch =false;
        	
        	ans = abs(asum - bsum);
        	if(ans < min) min =ans;
        	asum =0;
        	bsum =0;
        	System.out.println(cou);
        }
        
        
        System.out.println(min);

    }

	private static long abs(long l) {
		// TODO 自動生成されたメソッド・スタブ
		if(l > 0) return l;
		else return -l;
	}
    
     
}
class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    public double nextDouble() { return Double.parseDouble(next());}
}