#include <cstdio>
#include <iostream>
#include <cstring>

#define MAX_G 10010
#define INF 20000000

using namespace std;

int d[2][MAX_G], n, g;

int main() {
  int w, c, ant = 1, crt = 0;

  freopen("rucsac.in", "r", stdin);
  freopen("rucsac.out", "w", stdout);

  scanf ("%d %d", &n, &g);

  for(int i = 1; i <= n; i ++) {
    scanf("%d %d", &w, &c);
    ant = !ant;
    crt = !crt;
    memcpy (d[crt], d[ant], sizeof (d[ant]));
    for(int j = w; j <= g; j ++)
	d[crt][j] = max (d[crt][j], d[ant][j - w] + c);
  }

  printf ("%d\n", d[crt][g]);
  return 0;
}