#include<iostream>
#include<cstdio>
#define syy myson
using namespace std;
typedef long long LL;
const int maxn=3500;
LL n,m,w[maxn],d[maxn],f[13000],i;
int Main()
{
	freopen("charm.in","r",stdin);freopen("charm.out","w",stdout); 
	scanf("%d%d",&n,&m);
	for(i=1;i<=n;i++)
	  scanf("%d%d",&w[i],&d[i]);
	for(i=1;i<=n;i++)
	  for(int v=m;v>=w[i];v--)
	    if(f[v-w[i]]+d[i]>f[v])
		  f[v]=f[v-w[i]]+d[i]; 
	printf("%d",f[m]);
	return 0;
}
int main(){;};
int syy=Main();