knapsack (Memoization)

// Those who cannot remember the past are
// condemned to repeat it (use DP -_-)
// - George Santayana

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define ll long long
#define ull unsigned long long
#define MOD 1000000007
#define PI 3.14159265
#define ceil(a, b) ((a / b) + (a % b ? 1 : 0))
#define imin INT_MIN
#define imax INT_MAX
#define inf 2000000000
#define nl '\n'
#define modulo(a, b, mod) ((((a) % mod) * ((b) % mod)) % mod)
#define debug(x) cout << "x: " << x << nl;
#define debug2(x, y) cout << "x: " << x << " y: " << y << nl;
#define ordered_set tree<int, null_type, less<>, rb_tree_tag, tree_order_statistics_node_update>
#define ordered_map tree<int, int, less<>, rb_tree_tag, tree_order_statistics_node_update>

//vector<int> dx = {0, 0, 1, -1, 1, 1, -1, -1}, dy = {1, -1, 0, 0, 1, -1, 1, -1};
//vector<int> dx = {0, 0, 1, -1}, dy = {1, -1, 0, 0};

template<typename T = int> istream& operator>>(istream& in, vector<pair<int, int>>& v){
    for (auto& [x, y] : v) in >> x >> y;
    return in;
}

template<typename T = int> istream& operator>>(istream& in, vector<T>& v){
    for (T& i : v) in >> i;
    return in;
}

template<typename T = int> ostream& operator<<(ostream& out, const vector<T>& v){
    for (const T& x : v)
        out << x << ' ';
    return out;
}

void Start_Crushing() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
}
int n, w;
vector<int> a, b;

vector<vector<int>> dp;

int knapsack(int idx = 0, int curr = 0){
    if(idx == n - 1){
        return b[idx] * (curr + a[idx] <= w);
    }
    int& res = dp[idx][curr];
    if(~res)
        return res;

    res = knapsack(idx + 1, curr);
    if(curr + a[idx] <= w)
        res = max(res, b[idx] + knapsack(idx + 1, curr + a[idx]));

    return res;
}

void solve(){
    cin >> n >> w;
    a.resize(n), b.resize(n);
    dp.assign(n + 1, vector<int>(w + 1, -1));

    for(int i = 0; i < n; i++)
        cin >> a[i] >> b[i];

    cout << knapsack();
}

int main(){
    Start_Crushing();

    int t = 1;
//    /*Multiple test cases?*/ cin >> t;
    while (t--) {
        solve();
        if(!t) break;
        cout << nl;
    }

//    for(int tc = 1; tc <= t; tc++){
//        cout << "Case #" << tc << ": ";
//        solve();
//        if(tc != t)
//            cout << nl;
//    }

    return 0;
}