#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,gmax,i,j,m,dp[5001][5001],v[5001],g[5001],mx;
int main()
{
    fin>>n>>gmax;
    for (i=1;i<=n;i++)
    {
        fin>>g[i]>>v[i];
    }
    for (i=1;i<=n;i++)
        for (j=1;j<=m;j++)
        dp[i][j]=-1;
    for (i=1;i<=n;i++)
    {
        for (j=1;j<=gmax;j++)
        {
            if (j-g[i]>=0 && dp[i-1][j-g[i]]!=-1)
                {
                    dp[i][j]=max(dp[i][j],dp[i-1][j-g[i]]+v[i]);
                }
            dp[i][j]=max(dp[i][j],dp[i-1][j]);

        }
    }
    mx=0;
    for (i=0;i<=gmax;i++)
        if (dp[n][i]>mx) mx=dp[n][i];
    fout<<mx;
    return 0;
}