import java.util.Scanner;

public class Main {
    Scanner in = new Scanner(System.in);

    public void solve() {
        int n = in.nextInt();
        int[] a = new int[n], b = new int[n];
        for(int i = 0; i < n; i++){
            a[i] = in.nextInt();
            b[i] = in.nextInt();
        }
        int ap = 0, bp = 0;
        for(int i = 0; i < n; i++){
            if(Math.abs(ap + a[i] - bp) < Math.abs(bp + b[i] - ap)){
                ap += a[i];
            }else{
                bp += b[i];
            }
        }
        System.out.println(Math.abs(ap - bp));
        
    }

    public static void main(String[] args) {
        new Main().solve();
    }
}