#include <iostream>
#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");

int w[100], p[100];
int Optim[100];

int main()
{
    int n, ge, sol = 0;
    f >> n >> ge;
    for(int i = 1; i <= n; i++)
        f >> w[i] >> p[i];
    for(int i = 1; i <= n; i++)
        for(int j = ge - w[i]; j >= 0; j--)
            if(Optim[j + w[i]] < Optim[j] + p[i])
            {
                Optim[j + w[i]] = Optim[j] + p[i];
                if(Optim[j + w[i]] > sol)
                    sol = Optim[j + w[i]];
            }
    g << sol;
    return 0;
}