import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		solver();
	}

	static void solver() {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		long[] diff1 = new long[(int) pow(2, n / 2)];
		long[] diff2 = new long[(int) pow(2, n - n / 2)];
		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();
		}
		for (int i = 0; i < n / 2; i++) {
			int d = (int) pow(2, i);
			for (int j = 0; j < d; j++) {
				diff1[j + d] = diff1[j] - b[i];
				diff1[j] = diff1[j] + a[i];
			}
		}
		int res = n / 2;
		for (int i = 0; i < n - n / 2; i++) {
			int d = (int) pow(2, i);
			for (int j = 0; j < d; j++) {
				diff2[j + d] = diff2[j] - b[i + res];
				diff2[j] = diff2[j] + a[i + res];
			}
		}
		Arrays.sort(diff1);
		Arrays.sort(diff2);

		long min = Long.MAX_VALUE;
		int j = diff2.length - 1;
		for (int i = 0; i < diff1.length; i++) {
			min = Math.min(min, Math.abs(diff1[i] + diff2[j]));
			while (j != 0 && min > Math.abs(diff1[i] + diff2[j - 1])) {
				j--;
				min = Math.abs(diff1[i] + diff2[j]);
			}
		}
		System.out.println(min);
	}

	static long pow(long a, long n) {
		long A = a;
		long ans = 1;
		while (n >= 1) {
			if (n % 2 == 0) {
				A = A * A;
				n /= 2;
			} else if (n % 2 == 1) {
				ans = ans * A;
				n--;
			}
		}
		return ans;
	}

	static void tr(Object... o) {
		System.out.println(Arrays.deepToString(o));
	}
}