const INF: usize = 1usize << 60;
const LIMIT: usize = 1e5 as usize;

fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let items = (0..n).map(|_| {
            let mut temp = String::new();
            std::io::stdin().read_line(&mut temp).ok();
            let temp: Vec<usize> = temp.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
            (temp[0], temp[1])
        })
        .collect::<Vec<_>>();

    let mut dp = vec![vec![(INF, INF); LIMIT+1]; n+1];
    dp[0][0] = (0, 0);
    for i in 0..n {
        let (a, b) = items[i];
        for j in 0..=LIMIT {
            if dp[i][j] == (INF, INF) { continue; }
            let (ca, cb) = dp[i][j];
            let (na, nb) = (ca+a, cb);
            dp[i+1][na.max(nb)] = (na, nb);
            let (na, nb) = (ca, cb+b);
            dp[i+1][na.max(nb)] = (na, nb);
        }
    }
    println!("{}", (0..=LIMIT).filter(|&i| dp[n][i] != (INF, INF)).nth(0).unwrap());
}