#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]]));
			a[i][j] = max (a[i - 1][j] ,p[i] + a[i - 1][j - g[i]]);
		}
    }
    printf ("%d\n" , a[n - 1][gmax - 1]);
	/* for (int i = 0 ; i < n ; ++i)
    {
		for (int j = 0 ; j < gmax ; ++j)
			printf("%d " , a[i][j]);
		printf ("\n");
	 }*/
    return 0;
}