#include <iostream>
#include <fstream>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int a[5005], b[5005], mat[3][10005];
int main()
{
    int n, g;
    in>> n >> g;
    for(int i=1; i<=n; i++)
    {
        in>>a[i]>>b[i];
    }
    for(int i=1; i<=n; i++)
    {
        int m=i%2;
        for(int j=1; j<=g; j++)
        {
            mat[m][j]=mat[1-m][j];
            if(a[i]<=j)
                mat[m][j]=max(mat[1-m][j], mat[1-m][j-a[i]]+b[i]);
        }
    }
    out << mat[n%2][g];
    return 0;
}