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#include <iostream>
#include <cstdio>
using namespace std;
int a[10000],n,g,gr[5000],pr[5000];
void citire()
{
scanf("%d %d",&n,&g);
for(int i=1;i<=n;i++)
scanf("%d %d",&gr[i],&pr[i]);
}
void rez()
{
a[0]=1;
for(int i=1;i<=n;i++)
{
for(int j=g;j>=gr[i];j--)
if(a[j-gr[i]]!=0)
a[j]=max(a[j-gr[i]]+pr[i],a[j]);
}
//
//// while(a[g]==0)
//// g--;
//// printf("%d",a[g]-1);
//
//for(int i=0;i<=g;i++)
// cout<<a[i]<<endl;
int m=-1;
for(int i=1;i<=g;i++)
m=max(a[i],m);
printf("%d",m-1);
}
int main()
{
freopen("rucsac.in","r",stdin);
freopen("rucsac.out","w",stdout);
citire();
rez();
return 0;
}