#[allow(unused_imports)]
use std::io::Write;
use std::ops::Add;
use std::cmp::min;

#[allow(unused)]
macro_rules! debug {
    ($($format:tt)*) => (write!(std::io::stderr(), $($format)*).unwrap());
}
#[allow(unused)]
macro_rules! debugln {
    ($($format:tt)*) => (writeln!(std::io::stderr(), $($format)*).unwrap());
}

#[macro_export]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let mut s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

#[macro_export]
macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};

    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

#[macro_export]
macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };

    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };

    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };

    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };

    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}

fn main() {
    input! {
        n: usize,
        w: usize,
        items: [(usize, usize); n],
    }

    let sum_value: usize = items.iter().map(|&(w, v)| v).sum();

    // dp[i][j] = i番目までの品物で、価値jを達成するのに最小の重さ
    let mut dp: Vec<Vec<Option<usize>>> = vec![vec![None; sum_value + 1]; n + 1];
    dp[0][0] = Some(0);

    for i in 1..(n + 1) {
        let i = OneBased(i);
        let (wi, vi) = items[i.index()];
        for j in 0..(sum_value + 1) {
            if j >= vi {
                if let Some(w2) = dp[i.0 - 1][j - vi] {
                    // debugln!("count: {}, {}", i.0, j);
                    dp[i.0][j] = dp[i.0][j].map(|x| min(x, w2 + wi)).or(Some(w2 + wi));
                }
            }
            if let Some(w2) = dp[i.0 - 1][j] {
                dp[i.0][j] = dp[i.0][j].map(|x| min(x, w2)).or(Some(w2));
            }
        }
    }

    // for i in 0..(n + 1) {
    //     debugln!("{:?}", dp[i]);
    // }

    let mut ans = 0;
    for j in (0..(sum_value + 1)).rev() {
        if let Some(w2) = dp[n][j] {
            if w2 <= w {
                ans = j;
                break;
            }
        }
    }
    println!("{}", ans);
}

#[derive(Debug, Copy, Clone)]
struct OneBased(usize);

impl OneBased {
    fn new(n: usize) -> OneBased {
        if n == 0 {
            panic!("arg n should be positive number");
        }
        OneBased(n)
    }

    fn index(self) -> usize {
        let OneBased(n) = self;
        n - 1
    }
}

impl Add for OneBased {
    type Output = OneBased;

    fn add(self, other: OneBased) -> OneBased {
        OneBased::new(self.0 + other.0)
    }
}

mod utils {}


Measured memory_bytes: 211196