#include<iostream>
#include<cstdio>
#include<cctype>
#define gys mylove
using namespace std;
int n,m;
int w[3403],d[3403],a[12881];
inline void in(int &x)
{
    x=0;int f=1;char t=getchar();
    while(!isdigit(t)){if(t=='-')f=-1;t=getchar();}
    while(isdigit(t)){x=x*10+t-48;t=getchar();}
    x*=f;
}
inline void input(){
	in(n);in(m);
	for(int i=1;i<=n;i++) in(w[i]),in(d[i]);
}
inline void dpwork(){
	for(int i=1;i<=n;i++)
	 for(int v=m;v>=w[i];v--)
	  a[v]=(a[v-w[i]]+d[i]>a[v])? a[v-w[i]]+d[i]:a[v];//if(a[v-w[i]]+d[i]>a[v]) a[v]=a[v-w[i]]+d[i];
	printf("%d",a[m]);
}
int Main(){
	freopen("charm.in","r",stdin);
	freopen("charm.out","w",stdout);
	input();
	dpwork();
	return 0;
}
int main(){;}
int gys=Main();