import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.NoSuchElementException;
 
public class Main {
	private static FastScanner sc = new FastScanner();
	
	public static void main(String[] args) {
		int n = sc.nextInt();
		
		long[] A = new long[n];
		long[] B = new long[n];
		for(int i=0; i<n; i++) {
			A[i] = sc.nextLong();
			B[i] = -sc.nextLong();
		}
		
		int ln = n / 2;
		int rn = n - ln;
		
		long[] left = new long[1<<ln];
		for(int i=0; i<(1<<ln); i++) {
			for(int j=0; j<ln; j++) {
				if((i>>j & 1) == 1) {
					left[i] += A[j];
				} else {
					left[i] += B[j];
				}
			}
			
		}
		
		long[] right = new long[1<<rn];
		for(int i=0; i<(1<<rn); i++) {
			for(int j=0; j<rn; j++) {
				if((i>>j & 1) == 1) {
					right[i] += A[ln + j];
				} else {
					right[i] += B[ln + j];
				}
			}
			
		}
		
		Arrays.sort(right);
		
		long ans = Long.MAX_VALUE;
		for(int i=0; i<(1<<ln); i++) {
			int l = 0;
			int r = 1<<rn;
			int m = (l + r) / 2;
			while(l < r) {
				m = (l + r) / 2;
				if(left[i] + right[m] < 0) {
					if(m == 0) {
						break;
					} else if(Math.abs(left[i] + right[m]) < Math.abs(left[i] + right[m+1])) {
						break;
					} else {
						l = m+1;
					}
				} else {
					if(m == 1<<rn) {
						break;
					} else if(Math.abs(left[i] + right[m]) < Math.abs(left[i] + right[m-1])) {
						break;
					} else {
						r = m-1;
					}
				}
			}
			
			if(Math.abs(left[i] + right[m]) < ans) {
				ans = Math.abs(left[i] + right[m]);
			}
		}
		
		System.out.println(ans);
	}
	
	static 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;}
        private void skipUnprintable() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;}
        public boolean hasNext() { skipUnprintable(); 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() {
            return Long.parseLong(next());
        }
        public int nextInt(){
            return Integer.parseInt(next());
        }
        public double nextDouble(){
            return Double.parseDouble(next());
        }
    }
}