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#include <fstream>
using namespace std;
int a[5001], v[5001], cmax[10001], n, b[10001],gmax;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int main()
{
int i,j,g,k,vm;
fin>>n>>gmax;
for(i=1; i<=n; i++)
fin>>a[i]>>v[i];
for(j=1;j<=gmax;j++)
{
cmax[j]=-1;
/// b[j]=n+1;
}
vm=0;
for ( i=1;i<=n;i++)
{
for (j=vm;j>=0;j--)
if(j+a[i]<=gmax && cmax[j+a[i]]<cmax[j]+v[i])
{
cmax[j+a[i]]=cmax[j]+v[i];
if(j+a[i]>vm)
vm=j+a[i];
}
k=1;
}
vm=0;
for(g=1;g<=gmax;g++)
if(cmax[g]>vm)
{
vm=cmax[g];
/// gm=g;
}
fout<<vm;
/*
fout<<"vm="<<vm<<" gm="<<gm<<'\n';
j=gm;s=0;
do{
fout<<"sr="<<j<<'\n';
i=b[j];
fout<<i<<"-->"<<a[i]<<' '<<v[i]<<' '<<"cm="<<cmax[j]<<'\n'<<'\n';
s=s+v[i];
j=j-a[i];
}while(j>0);
fout<<s<<'\n';
*/
return 0;
}