#include <bits/stdc++.h>
using namespace std;

int dp[5005], w[10005], p[10005];

int main()
{
    ifstream cin("rucsac.in");
    ofstream cout("rucsac.out");
    int n, G;
    cin >> n >> G;

    for (int i = 1; i <= n; ++i)
    {
        int g, v;
        cin >> g >> v;
        for (int j = G; j >= g; --j)
            dp[j] = max(dp[j], dp[j-g]+v);
    }

    int ans = 0;
    for (int i = 0; i <= G; ++i)
        ans = max(ans, dp[i]);

    cout << ans;

    return 0;
}