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

const int MAXN = 5005;

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int n, g;
int dp[MAXN][2 * MAXN], W[MAXN], P[MAXN];

int main()
{
	fin >> n >> g;
	for (int i = 1; i <= n; ++i)
		fin >> W[i] >> P[i];
	for (int i = 1; i <= n; ++i)
	{
		for (int cw = 0; cw <= g; ++cw)
		{
			dp[i][cw] = dp[i - 1][cw];
			if (W[i] <= cw)
				dp[i][cw] = max(dp[i][cw], dp[i - 1][cw - W[i]] + P[i]);
		}
	}
	fout << dp[n][g];
	fin.close(); fout.close();
	return 0;
}