#include <bits/stdc++.h>
#include <cstdio>
#include <string>

using namespace std;

#define INF 100000000
#define YJ 1145141919
#define INF_INT_MAX 2147483647
#define INF_LL_MAX 9223372036854775807
#define EPS 1e-10
#define MOD 1000000007
#define Pi acos(-1)
#define LL long long
#define ULL unsigned long long
#define LD long double

#define int long long

const int MAX_N = 105;
const int MAX_A = 1005;

int N;
int A[MAX_N], B[MAX_N];

int dp[MAX_N][MAX_N*MAX_A];

signed main()
{
    cin >> N;
    for(int i = 0; i < N; i++) {
        cin >> A[i] >> B[i];
    }

    for(int i = 0; i < MAX_N; i++) {
        for(int j = 0; j < MAX_N * MAX_A; j++) {
            dp[i][j] = INF;
        }
    }

    dp[0][0] = 0;
    
    for(int i = 0; i < N; i++) {
        for(int j = 0; j < MAX_N * MAX_A; j++) {
            if(dp[i][j] == INF) {
                continue;
            }
            dp[i+1][j + A[i]] = min(dp[i+1][j + A[i]], dp[i][j]);
            dp[i+1][j] = min(dp[i+1][j], dp[i][j] + B[i]);
        }
    }

    int ans = INF;
    for(int i = 0; i < MAX_N * MAX_A; i++) {
        if(dp[N][i] == INF) continue;
        ans = min(ans, max(i, dp[N][i]));
    }

    cout << ans << endl;

    return 0;
}