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

public class Main {

	public static int MAX = 20000;

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		House[] h = new House[n];
		for(int i=0;i<n;i++) {
			int v = sc.nextInt();
			int t = sc.nextInt();
			h[i] = new House(v,t);
		}
		Arrays.sort(h,(a,b)->Integer.compare(a.v + a.t, b.v + b.t));
		boolean[] dp = new boolean[MAX+1];
		dp[0] = true;
		for(int i=0;i<n;i++) {
			for(int j=h[i].t-1;j>=0;j--) {
				if (dp[j]) {
					dp[j+h[i].v] = true;
				}
			}
		}
		int max = 0;
		for(int i=0;i<=MAX;i++) {
			if (dp[i]) {
				max = i;
			}
		}
		System.out.println(max);
	}

	static class House {
		int v,t;
		public House(int v,int t) {
			this.v = v;
			this.t = t;
		}
	}

}