#include<iostream>
#include<fstream>
using namespace std;

ifstream f("rucsac.in");
ofstream g("rucsac.out");

struct coord
{
    int weight,profit;
};

int n,m;
coord v[5005];
int dp[5005][10005];

void citire()
{
    f>>n>>m;
    for(int i=1;i<=n;i++)
        f>>v[i].weight>>v[i].profit;
}

int bkt(int cap, int poz)
{   
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=m;j++)
        {
            if(j - v[i].weight >= 0 )
                dp[i][j] = max(v[i].profit + dp[i-1][j-v[i].weight],dp[i-1][j]);
            else
                dp[i][j] = dp[i-1][j];
            //cout<<dp[i][j]<<" ";
        }
        //cout<<"\n";
    }
    return dp[n][m];
}
int main()
{
    citire();
    g<<bkt(m,n);
}