#include <iostream>
#include <fstream>
using namespace std;
ifstream in ("rucsac.in");
ofstream out ("rucsac.out");

int n,g;
int dp[5010][10010], p[5010], w[5010];

inline int max(int a, int b)
{
	if(a>b)return a;
	return b;
}
int main()
{
	in >> n >> g;
	for(int i = 1; i <= n; i++)
		in >> w[i] >> p[i];
	for(int i = 1; i <= n; i++)
	{
		for(int j = 0; j <= g; j++)
		{
			if(j >=w[i])
				dp[i][j]=max(dp[i-1][j],dp[i-1][j-w[i]]+p[i]);
			else
				dp[i][j]=dp[i-1][j];
		}
	}
	out << dp[n][g];
}