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#include<fstream>
using namespace std;
ifstream fin("energii.in");
ofstream fout("energii.out");
unsigned int gr,n,v[5001]={0},g[5001]={0},a[10001]={0},b[10001]={0},i,j;
int main()
{
fin>>n;
fin>>gr;
for(int i=1;i<=n;i++)
{
fin>>g[i];
fin>>v[i];
}
for( i=1;i<=n;i++)
{
for( j=1;j<=gr;j++)
{
b[j]=a[j];
if(j>=g[i])
b[j]=max(a[j],a[j-g[i]]+v[i]);
}
for( j=1;j<=gr;j++)
{
a[j]=b[j];
}
}
fout<<a[gr];
}