Problem:
Score : 100 points

Problem Statement

There are N items, numbered 1, 2, \ldots, N.
For each i (1 \leq i \leq N), Item i has a weight of w_i and a value of v_i.

Taro has decided to choose some of the N items and carry them home in a knapsack.
The capacity of the knapsack is W, which means that the sum of the weights of items taken must be at most W.

Find the maximum possible sum of the values of items that Taro takes home.

Constraints

All values in input are integers.

1 \leq N \leq 100

1 \leq W \leq 10^9

1 \leq w_i \leq W

1 \leq v_i \leq 10^3

Input

Input is given from Standard Input in the following format:

N W
w_1 v_1
w_2 v_2
:
w_N v_N

Output

Print the maximum possible sum of the values of items that Taro takes home.

Sample Input 1

3 8
3 30
4 50
5 60

Sample Output 1

90

Items 1 and 3 should be taken.
Then, the sum of the weights is 3 + 5 = 8, and the sum of the values is 30 + 60 = 90.

Sample Input 2

1 1000000000
1000000000 10

Sample Output 2

10

Sample Input 3

6 15
6 5
5 6
6 4
6 6
3 5
7 2

Sample Output 3

17

Items 2, 4 and 5 should be taken.
Then, the sum of the weights is 5 + 6 + 3 = 14, and the sum of the values is 6 + 6 + 5 = 17.

Solution in C++ (GCC 9.2.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl "\n"
#define speed ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define pb push_back
#define F first
#define S second
#define um map <ll,ll>
#define rep(i,z,n)  for(int i=z;i<n;i++)
#define repi(i,z,n) for(int i=z;i<=n;i++)
#define repn(i,z,n) for(int i=n-1;i>=z;i--)
#define vec vector<ll>
#define vecp vector<pair<ll,ll>>
#define pi (double)3.14159265358979323846
#define ld long double
#define all(z) z.begin(),z.end()

ll power(ll a, ll b, ll m) { ll ans = 1; a = a % m; if (a == 0) return 0; while (b) { if (b & 1) ans = (ans * a) % m; b /= 2; a = (a * a) % m; } return ans; }
ll modInverse(ll a, ll m) {return power(a, m - 2, m);}
ll binpow(ll a, ll b) {ll res = 1; while (b > 0) {if (b & 1)res = res * a; a = a * a; b >>= 1;} return res;}
ll binlog2(ll n) {ll logValue = -1; while (n) {logValue++; n >>= 1;} return logValue;}
void print(vec a) {rep(i, 0, a.size())cout << a[i] << " "; cout << endl;}
const ll mod = 1e9 + 7;
const ll N = 1e5 + 5;
const ll inf = 2e18;




void solve() {
    ll n, w ;
    cin >> n >> w;
    ll tot = 0;
    vecp vp(n);
    rep(i, 0, n) {
        cin >> vp[i].F >> vp[i].S;
        tot += vp[i].S;
    }

    ll dp[n + 1][tot + 1];
    dp[0][0] = 0;
    repi(i, 1, tot)
    dp[0][i] = inf;
    ll ans = 0;
    repi(i, 1, n) {
        repi(j, 0, tot) {
            if (j >= vp[i - 1].S) {
                dp[i][j] = min(dp[i - 1][j], dp[i - 1][j - vp[i - 1].S] + vp[i - 1].F);
            }
            else {
                dp[i][j] = dp[i - 1][j];
            }
            if (dp[i][j] <= w)
                ans = max(ans, (ll) j);
        }
    }

    cout << ans << endl;

}





int main() {
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif

    speed;
    int test = 1;
    // cin >> test;
    while (test--) {
        // cout << "Case #" << t1 << ": ";
        solve();
    }
    return 0;
}