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#include <fstream>
#define DMAX 5005
#define NMAX 10005
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,GMAX;
int cmax[NMAX],c[DMAX],g[DMAX];
void citire();
void pd();
int main()
{
citire();
pd();
fout<<cmax[GMAX]<<'\n';
return 0;
}
void citire()
{int i;
fin>>n>>GMAX;
for(i=1;i<=n;i++)
fin>>g[i]>>c[i];
}
void pd()
{int i,x;
for(i=1;i<=n;i++)
for(x=GMAX;x>=1;x--)
if(x>=g[i])
if(cmax[x]<c[i]+cmax[x-g[i]])
cmax[x]=c[i]+cmax[x-g[i]];
}