#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int v[5001],dp[10001];
int n,i,j,maxx;
int g,gmax,p;
int main()
{
    fin>>n>>gmax;

    dp[0]=0;
    for(i=1;i<=gmax;i++)
        dp[i]=-1;

    for(j=1;j<=n;j++)
        {
            fin>>g>>p;

            for(i=gmax-g;i>=0;i--)
            {
                if(dp[i]!=-1 && dp[i]+p>dp[i+g])
                {
                    dp[i+g]=dp[i]+p;
                }
            }

        }

    for(i=1;i<=gmax;i++)
        if(dp[i]>maxx)
          maxx=dp[i];

    fout<<maxx;

    return 0;
}