#include <bits/stdc++.h>
#include <sys/time.h>

using namespace std;


using ll = long long;
using ull = unsigned long long;
using ld = long double;
using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vl = vector<long>;
using vvl = vector<vl>;
using vll = vector<ll>;
using vvll = vector<vll>;
using vb = vector<bool>;
using vvb = vector<vb>;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using vpii = vector<pii>;
using vpll = vector<pll>;
using vstr = vector<string>;
constexpr ll INF_LL=1LL<<62;
constexpr int INF_I=1LL<<30;
#define rep(i,n) for(int i=0; i<((int)(n)); i++)
#define reps(i,n) for(int i=1; i<=((int)(n)); i++)
#define vector_cin(x) for(auto &n : (x)) cin >> n
#define ALL(x) (x).begin(), (x).end()
#define YesNo(x) ((x) ? "Yes": "No")
#define pb emplace_back
#define to_lower(S) transform(ALL((S)), (S).begin(), ::tolower)
#define to_upper(S) transform(ALL((S)), (S).begin(), ::toupper)
template <typename T>
bool chmax(T &a, const T& b) {if (a < b){a = b;return true;}return false;}

template <typename T>
bool chmin(T &a, const T& b) {if (a > b){a = b;return true;}return false;}
ll ceilint(ll x, ll y) {return (x + y - 1) / y;}
void Main();
int main() {std::cin.tie(nullptr);std::ios_base::sync_with_stdio(false);std::cout << std::fixed << std::setprecision(15);Main();return 0;}

//-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-

void Main() {
    ll N, I;
    cin >> N >> I;
    vll S(N), A(N);
    rep(i, N) cin >> S[i] >> A[i];
    vvll dp(N + 2, vll(I + 2, 0));
    rep(i, N) {
        rep(j, I + 1) {
            if (j >= S[i]) dp[i + 1][j] = max(dp[i][j - S[i]] + A[i], dp[i][j]);
            else dp[i + 1][j] = dp[i][j]; 
        }
    }
    cout << dp[N][I] << endl;
}