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#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
struct adat
{
long long suly, ar;
};
int i,j,veg,n;
long long maxi;
int main()
{
cin>>n>>veg;
vector <adat> x(n+1);
vector <long long> v(veg+1);
for(i=1; i<=n; ++i)
{
cin>>x[i].suly>>x[i].ar;
}
for(j=1; j<=n; ++j)
{
for(i=veg; i>0; --i)
{
if(v[i]) {
if(i+x[j].suly<=veg)
v[i+x[j].suly]=max(v[i]+x[j].ar,v[i+x[j].suly]);
}
}
v[x[j].suly]=max(x[j].ar,v[x[j].suly]);
}
for(i=veg; i>0; --i)
if(v[i]>maxi) maxi=v[i];
cout<<maxi;
return 0;
}