#include <iostream>
#include <fstream>

using namespace std;
int m[5001][10001];
int main()
{
    ifstream fin ("rucsac.in");
    ofstream fout ("rucsac.out");
    int v[5001],c[5001];
    int g,n;
    fin>>n>>g;
    for(int i=1; i<=n; i++)
    {
        fin>>v[i]>>c[i];
        for(int j=1; j<=g; j++)
            if(v[i]<=j)
                m[i][j]=max(m[i-1][j-v[i]]+c[i],m[i-1][j]);
    }
    fout<<m[n][g];
    return 0;
}