import java.io.FileNotFoundException;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws FileNotFoundException {
		new Main().run();
	}

	void run() {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[][] ok = new int[N + 1][100000 + 1];
		for (int i = 0; i < ok.length; ++i) {
			for (int j = 0; j < ok[i].length; ++j) {
				ok[i][j] = Integer.MAX_VALUE / 3;
			}
		}
		ok[0][0] = 0;
		for (int i = 0; i < N; ++i) {
			int A = sc.nextInt();
			int B = sc.nextInt();
			for (int j = 0; j < ok[i].length; ++j) {
				if (ok[i][j] == Integer.MAX_VALUE / 3)
					continue;
				ok[i + 1][j + A] = Math.min(ok[i + 1][j + A], ok[i][j]);
				ok[i + 1][j] = Math.min(ok[i + 1][j], ok[i][j] + B);
			}
		}
		int ans = Integer.MAX_VALUE / 3;
		for (int i = 0; i < ok[N].length; ++i) {
			ans = Math.min(ans, Math.max(i, ok[N][i]));
		}
		System.out.println(ans);
	}

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

}