#include <bits/stdc++.h>
using namespace std;

int main() {
    int64_t N, I;
    cin >> N >> I;
    vector<int64_t> s(N), a(N);
    for (int64_t i = 0; i < N; i++) {
        cin >> s[i] >> a[i];
    }

    vector<vector<int64_t>> dp(N + 1, vector<int64_t>(I + 1, 0));

    for (int64_t i = 0; i < N; i++) {
        for (int64_t j = 0; j <= I; j++) {
            dp[i + 1][j] = max(dp[i + 1][j], dp[i][j]);
            const int64_t nj = j + s[i];
            if (nj <= I) {
                dp[i + 1][nj] = max(dp[i + 1][nj], dp[i][j] + a[i]);
            }
        }
    }
    int64_t ans = 0;
    for (int64_t j = 0; j <= I; j++) {
        ans = max(ans, dp[N][j]);
    }
    cout << ans << endl;
}