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

fstream f("rucsac.in" , ios::in), fo("rucsac.out", ios::out);

int mat[3][10001];

int main()
{
    int n,g,v,w,in=1,ma;
    f>>n>>g;
    for(int i=1;i<=n;i++)
    {
        f>>w>>v;
        for(int j=w;j<=g;j++)
        {
            if(mat[i%2-in][j-w]+v>mat[i%2-in][j])
                mat[i%2][j]=mat[i%2-in][j-w]+v;
            else
                mat[i%2][j]=mat[i%2-in][j];
        }
        in=-in;
        ma=mat[i%2][g];
    }
    fo<<ma;
    return 0;
}