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#include <fstream>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
struct sdt
{
int gr,pr;
}a[5003];
int s[10003];
int main()
{
int n,g,gmax;
in>>n>>g;
for(int i=1;i<=n;i++)
{
in>>a[i].gr>>a[i].pr;
}
if(a[1].gr<=g)
{
gmax=a[1].gr;
s[gmax]=a[1].pr;
}
else
gmax=0;
for(int i=2;i<=n;i++)
{
for(int j=gmax;j>=0;j--)
{
if(s[j]!=0)
if(j+a[i].gr<=g)
s[j+a[i].gr]=max(s[j+a[i].gr],s[j]+a[i].pr);
}
if(gmax+a[i].gr<=g)
{
gmax+=a[i].gr;
}
else gmax=g;
}
out<<s[g];
return 0;
}