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#include <fstream>
using namespace std;
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
#define NMAX 50001
#define MAXG 100001
int n,g,x,c,sol;
int w[NMAX],P[NMAX];
int opt[MAXG];
int main()
{
cin>>n>>g;
for(int i=1;i<=n;i++)
{
cin>>w[i]>>P[i];
}
for(int i=1;i<=n;i++)
for(int j=g-w[i];j>=0;--j)
{
if(opt[j+w[i]]<opt[j]+P[i])
{
opt[j+w[i]]=opt[j]+P[i];
if(opt[j+w[i]]>sol)
sol=opt[j+w[i]];
}
}
cout<<sol;
return 0;
}