#include <cstdio>
#define N 5010
#define G 10010
int a[N][G];
int g[N];
int p[N];
#define max2 (x,y) ((x>y)?x:y)
#define maxim (x , y , z) (max2 (x , max2 (y , z)))
int max (int x , int y)
{
	if (x > y)
		return x;
	return y;
}
int main()
{
	freopen ("rucsac.in" , "r" , stdin);
	freopen ("rucsac.out" , "w" , stdout);
	int n , gmax;
	scanf ("%d %d\n" , &n , &gmax);
	for (int i = 0 ; i < n ; ++i)
	{
		int x , y;
		scanf ("%d %d" , &x , &y);
		g[i] = x;
		p[i] = y;
	}
	for (int i = 0 ; i < n ; ++i)
	{
		for (int j = 0 ; j < gmax ; ++j)
		{
			if (j >= g[i] - 1 || a[i - 1][j] != 0 )
				a[i][j] = max (a[i - 1][j] , max(a[i][j - 1] , p[i] + a[i - 1][j - g[i]]));
		}
	}
	printf ("%d\n" , a[n - 1][gmax - 1]);
	return 0;
}