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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int profit[10001];
struct element
{
int g;
int v;
}f[5000];
int main()
{
int n,G;
in>>n>>G;
for(int i=0; i<n; i++)
in>>f[i].g>>f[i].v;
// cazurile de baza
profit[0]=0; //nu aleg niciun obiect
for(int i=1; i<=G; i++)
profit[i]=-1;
for(int i=0; i<n; i++)
for(int j=G; j>=f[i].g; j--)
{
if(profit[j-f[i].g]!=-1 && profit[j]< profit[j-f[i].g]+ f[i].v)
{
profit[j]= profit[j-f[i].g]+ f[i].v;
}
}
int maxim=profit[1];
for(int i=2; i<=G; i++)
{
if(maxim<profit[i])
maxim= profit[i];
}
out<<maxim;
return 0;
}