import java.util.*;

public class Main {
	public static void main (String[] args) {
    	Scanner sc = new Scanner(System.in);
    	int n = sc.nextInt();
    	long[] adds = new long[n];
    	long[] dp = new long[1 << n];
    	for (int i = 0; i < n; i++) {
    	    long a = sc.nextLong();
    	    long b = sc.nextLong();
    	    dp[0] += b;
    	    adds[i] = a + b;
    	}
    	long min = dp[0];
    	for (int i = 1; i < (1 << n); i++) {
    	    for (int j = 0; j < n; j++) {
    	        if ((i & (1 << j)) != (1 << j)) {
    	            continue;
    	        }
    	        dp[i] = dp[i ^ (1 << j)] - adds[j];
    	        break;
    	    }
    	    min = Math.min(min, Math.abs(dp[i]));
    	}
    	System.out.println(min);
    }
}