/* -*- coding: utf-8 -*-
 *
 * 2093.cc:  No.2093 Shio Ramen - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

const int MAX_N = 1000;
const int MAX_S = 1000;

/* typedef */

/* global variables */

int ss[MAX_N], as[MAX_N];
int dp[MAX_S + 1];

/* subroutines */

inline void setmax(int &a, int b) { if (a < b) a = b; }

/* main */

int main() {
  int n, s;
  scanf("%d%d", &n, &s);
  for (int i = 0; i < n; i++) scanf("%d%d", ss + i , as + i);

  fill(dp, dp + s + 1, -1);
  dp[0] = 0;

  for (int i = 0; i < n; i++)
    for (int j = s - ss[i]; j >= 0; j--)
      if (dp[j] >= 0)
	setmax(dp[j + ss[i]], dp[j] + as[i]);

  int maxd = 0;
  for (int j = 0; j <= s; j++) setmax(maxd, dp[j]);

  printf("%d\n", maxd);

  return 0;
}