#include <iostream>
#include <cstdint>
#include <vector>

using namespace std;

int main()
{
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	
	uint16_t N, I, i, j;
	cin >> N >> I;
	vector<uint16_t> s(N), a(N);
	for (i = 0; i != N; ++i) cin >> s[i] >> a[i];

	vector<uint32_t> dp(I + 1, 0);
	for (i = 0; i != N; ++i)
	{
		for (j = I; j >= s[i]; --j)
			if (dp[j] < dp[j - s[i]] + a[i])
				dp[j] = dp[j - s[i]] + a[i];
	}

	cout << dp[I] << '\n';
	return 0;
}