#include <bits/stdc++.h>
#define all(vec) vec.begin(), vec.end()
using namespace std;
using ll = long long;
using P = pair<int, int>;
constexpr ll INF = (1LL << 30) - 1LL;
constexpr ll LINF = (1LL << 60) - 1LL;
constexpr ll MOD = 1e9 + 7;
template <typename T> void chmin(T &a, T b) { a = min(a, b); }
template <typename T> void chmax(T &a, T b) { a = max(a, b); }
int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n, k;
    cin >> n >> k;
    vector<P> v;
    for (int i = 0; i < n; i++) {
        int p, d;
        cin >> p >> d;
        v.push_back(P(p, d));
    }
    sort(all(v));
    vector<vector<vector<int>>> dp(
        n + 1, vector<vector<int>>(k + 1, vector<int>(2, -INF)));
    dp[n][0][0] = 0;
    for (int i = n - 1; i >= 0; i--) {
        for (int j = 0; j <= k; j++) {
            chmax(dp[i][j][0], dp[i + 1][j][0]);
            chmax(dp[i][j][1], dp[i + 1][j][1]);
            chmax(dp[i][j][0], dp[i + 1][j][1] + v[i].second);
            if (j >= v[i].first) {
                chmax(dp[i][j][1], dp[i + 1][j - v[i].first][0] + v[i].second);
            }
        }
    }
    int res = 0;
    for (int i = 0; i <= k; i++) {
        chmax(res, dp[0][i][0]);
        chmax(res, dp[0][i][1]);
    }
    cout << res << endl;
}