#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cctype>
#include <cmath>
#include <string>
#include <algorithm>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <stack>
#include <cassert>
using namespace std;

#define PRO "kfib"
void OpenFiles(int EVAL)
{
	if(EVAL)
	{
		char input[100] = PRO, output[100] = PRO;
		freopen(strcat(input, ".in"),"r",stdin);
		freopen(strcat(output,".out"),"w",stdout);
	} else
	{
		freopen("test.in","r",stdin);
		//freopen("test.out","w",stdout);
	}
}

#define MAX  10001
#define INF 0xffffff

int n,g,pr[MAX];

int main(int argv,char *args[])
{
	OpenFiles(argv==0);
	// start
	int w,p;
		scanf("%d %d",&n,&g);
		for(int i=1;i<=n;i++)
		{
			scanf("%d %d",&w,&p);
			for(int i=g;i-w>=0;i--)
				pr[i]=max(pr[i],pr[i-w]+p);
		}
		printf("%d\n",pr[g]);
	return 0;
}