#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <deque>
#include <atcoder/modint>

using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(int)(n); i++)

const i64 INF = 1001001001001001001;
using Modint = atcoder::static_modint<998244353>;

int main(){
    int N; cin >> N;
    int I; cin >> I;
    vector<int> S(N), A(N);
    rep(i,N) cin >> S[i] >> A[i];
    vector<int> dp(I+1, 0);
    rep(i,N){
        for(int s=I; s>=S[i]; s--) dp[s] = max(dp[s], dp[s-S[i]] + A[i]);
    }
    cout << dp[I] << '\n';
    return 0;
}


struct ios_do_not_sync{
    ios_do_not_sync(){
        std::ios::sync_with_stdio(false);
        std::cin.tie(nullptr);
    }
} ios_do_not_sync_instance;