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#include <fstream>
#define INF 2000000001
using namespace std;
ifstream f("energii.in");
ofstream g("energii.out");
int n,gmax,i,x,y,j,a[100011];
int main()
{
f>>n;
f>>gmax;
for(i=1;i<=n;i++)
{
f>>x>>y;
for(j=gmax-x;j>=0;j--)
if(a[j+x]==0 || a[j+x]<a[j]+y)
a[j+x]=a[j]+y;
}
if(a[gmax]==INF)
g<<-1;
else
g<<a[gmax]<<'\n';
return 0;
}