#include <bits/stdc++.h>

using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int w[5007], p[5007];
int dp[10007];
int main()
{
    int n, g;
    fin >> n >> g;

    for(int i = 1; i <= n; i++)
    {
        fin >> w[i] >> p[i];
    }
    int maxim = 0;
    for(int i = 1; i <= n; i++)
    {
        for(int j = g - w[i]; j >= 0; j--)
        {
            dp[j + w[i]] = max(dp[j + w[i]], dp[j] + p[i]);
            maxim = max(maxim, dp[j + w[i]]);
        }
    }
    fout << maxim;
    return 0;
}