#include <fstream>

using namespace std;
int m[10005], p[10005], dp[2][10005], sol[5005];
int main()
{
	ifstream cin("rucsac.in");
	ofstream cout("rucsac.out");

		int n, g, a, b, s=0;
		cin>>n>>g;

		for(int i=0;i<n;i++)
		{
			cin>>m[i]>>p[i];
		}

		for(int i=0;i<n;i++)
		{
			for(int j=0;j<=g;j++)
			{
				dp[(i+1)%2][j]=0;
        if(j<m[i])
					dp[(i+1)%2][j]=dp[i%2][j];
				else
					dp[(i+1)%2][j]=max(dp[i%2][j], dp[i%2][j-m[i]] + p[i]);
			}
		}

		cout<<dp[n%2][g];

    return 0;
}