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#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int v[10001],x,n,g,w,p,i,Max,j;
int main()
{
fin>>n>>g;
for(i=1;i<=g;i++)
v[i]=-1;
v[0]=0;
for(i=1;i<=n;i++){
fin>>w>>p;
x=g-w;
for(j=x;j>=0;j--)
if(v[j]!=-1&&v[j+x]<v[j]+p){
v[j+x]=v[j]+p;
}
}
for(i=1;i<=g;i++)
Max=max(Max,v[i]);
fout<<Max;
return 0;
}