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#include<fstream>
#include<vector>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int main()
{
vector<int> p,g,u,d;
int n,m,i,j;
in>>n>>m;
p.resize(n+1);
g.resize(n+1);
u.resize(m+1);
d.resize(m+1);
for(i=1;i<=n;i++) in>>g.at(i)>>p.at(i);
for(i=0;i<=m;i++) u.at(i)=p.at(1)*(g.at(1)<=i);
for(j=2;j<=n;j++)
{
for(i=1;i<=m;i++)
if(i>=g.at(j)) d.at(i)=u.at(i)*(u.at(i)>=u.at(i-g.at(j))+p.at(j))+(u.at(i-g.at(j))+p.at(j))*(u.at(i)<u.at(i-g.at(j))+p.at(j));
else d.at(i)=u.at(i);
u=d;
}
out<<d.at(m);
}