#include <iostream>
#include <fstream>
#define N_MAX 5005
#define W_MAX 10005
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int dp[2][W_MAX], w[N_MAX], p[N_MAX], n, W;
void copyToFirst()
{
    for(int i = 0; i <= W; i++)
        dp[0][i] = dp[1][i];
}
int main()
{
    f >> n >> W;
    for(int i = 1; i <= n; i++)
        f >> w[i] >> p[i];
    for(int i = 1; i <= n; i++)
    {
        for(int j = 0; j <= W; j++)
            if(dp[0][j])
                if(j + w[i] <= W)
                {
                    dp[1][j + w[i]] = max(dp[1][j + w[i]], dp[0][j] + p[i]);
                }
        dp[1][w[i]] = max(dp[1][w[i]], p[i]);
        copyToFirst();
    }
    int rez = -1;
    for(int i = 0; i <= n; i++)
        rez = max(rez, dp[0][i]);
    g << rez;
    return 0;
}