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#include <fstream>
using namespace std;
ifstream f("energii.in");
ofstream g("energii.out");
int A[10010],p,u,i,j,E[5010],C[5010],gg,sol,w;
int main()
{
f>>gg>>w;
for(i=1;i<=gg;i++)
f>>E[i]>>C[i];
for(i=1;i<=gg;i++)
for(j=w;j>=0;j--)
if(j+E[i]<=w&&A[j+E[i]]<A[j]+C[i])
A[j+E[i]]=A[j]+C[i];
sol=0;
for(i=1;i<=w;i++)
if(A[i]>sol) sol=A[i];
g<<sol;
return 0;
}