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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,g,i,w[5001],p[5001],pf[10001],MAX,j;
int main()
{
fin>>n>>g;
for(i=1;i<=n;i++)
fin>>w[i]>>p[i];
for(i=1;i<=n;i++)
for(j=g-w[i];j>=0;j--)
if(pf[j+w[i]]<pf[j]+p[i])
{
pf[j+w[i]]=pf[j]+p[i];
if(pf[j+w[i]]>MAX) MAX=pf[j+w[i]];
}
fout<<MAX;
return 0;
}