#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i=0;i<(n);i++)
typedef long long ll;
//using mint = modint;
using mint = modint998244353;
using P = pair<int, int>;

const ll INF=1LL<<60, dx[]={0,1,0,-1},dy[]={1,0,-1,0};
bool chmin(ll& a,ll b){if(a>b){a=b; return 1;} return 0;}
bool chmax(ll& a,ll b){if(a<b){a=b; return 1;} return 0;}

int main(){

    int n,maxi;
    cin >> n >> maxi;
    vector<int> s(n),a(n);

    rep(i,n) cin >> s[i] >> a[i];

    vector<vector<ll>> dp(1001,vector<ll> (1001,-INF));
    rep(i,1001) dp[i][0]=0;

    for(int i=1;i<=n;i++){
        rep(j,maxi+1){
            if(j-s[i-1]>=0) dp[i][j]=max(dp[i-1][j-s[i-1]]+a[i-1],dp[i-1][j]);
            else dp[i][j]=dp[i-1][j];
        }
    }

    /*
    rep(i,n+1){
        rep(j,maxi+1) {
            cout << i << " " << j << " " << dp[i][j] << endl;
        }
    }
    */
    
    cout << dp[n][maxi] << endl;
 

    return 0;
}