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#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,gg,i,j,g[5005],v[5005],sum[10005];
int main()
{
fin>>n>>gg;
for(int i=1;i<=n;i++)
fin>>g[i]>>v[i];
sum[0]=0;
for(i=1;i<=n;i++)
for(j=gg-g[i];j>=0;j--)
{
if(sum[j+g[i]]<sum[j]+v[i])
sum[j+g[i]]=sum[j]+v[i];
}
fout<<sum[gg];
return 0;
}