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

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int n,g,s,ans;
vector<int> gr,pr;
vector<vector<int> > dp;

int main()
{
    fin>>n>>g;
    gr.resize(n+1);
    pr.resize(n+1);
    dp.assign(2,vector<int>(g+1,-1));
    for(int i=1;i<=n;i++){
        fin>>gr[i]>>pr[i];
    }
    dp[0][0]=0;
    dp[1][0]=0;
    s=0;
    for(int i=1;i<=n;i++,s=1-s){
        dp[s].assign(g+1,-1);
        for(int j=0;j<=g;j++){
            if(dp[1-s][j]>=0)
            dp[s][j]=dp[1-s][j];

            if(j>=gr[i]&&dp[1-s][j-gr[i]]>=0&&dp[s][j]<dp[1-s][j-gr[i]]+pr[i]){
                dp[s][j]=dp[1-s][j-gr[i]]+pr[i];
            }
        }
    }
    s=1-s;
    for(int i=0;i<=g;i++)ans=max(ans,dp[s][i]);
    fout<<ans;
}