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#include <iostream>
#include <fstream>
using namespace std;
int w[5005],p[5005],n,g,a[5005];
void citire()
{
ifstream fin("rucsac.in");
fin>>n>>g;
for(int i=1;i<=n;i++)
fin>>w[i]>>p[i];
}
int maxim(int x,int y)
{
if(x>y)
return x;
return y;
}
int fct()
{
for(int i=w[1];i<=g;i++)
a[i]=p[1];
for(int i=2;i<=n;i++)
for(int j=g;j>0;j--)
a[j]=maxim(a[j],p[i]+a[j-w[i]]);
return a[g];
}
int main()
{
citire();
ofstream fout("rucsac.out");
fout<<fct();
return 0;
}