#include<iostream>
#include<cstdio>
#include<algorithm>
using namespace std;
int m,n;
int wei[3410],jia[3410];
long long int f[13000];
int main()
{
	freopen("charm.in","r",stdin);
	freopen("charm.out","w",stdout);
	scanf("%d%d",&n,&m);
	for(int i=1;i<=n;i++)
        scanf("%d%d",&wei[i],&jia[i]);
    for(int i=1;i<=n;i++)
      for(int j=m;j>=wei[i];j--)
        if(f[j-wei[i]]+jia[i]>f[j])
          f[j]=f[j-wei[i]]+jia[i];
    printf("%lld",f[m]);
	fclose(stdin);
	fclose(stdout);
	return 0;
}