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#include <iostream>
#include <fstream>
#include <vector>
#define gmax 5005
#define nmax 2005
using namespace std;
int n, gen;
int ener[nmax][gmax];
int eg[nmax], cg[nmax];
void read()
{
ifstream f("energii.in");
f >> n >> gen;
for(int i=1; i<=n; ++i)
{
f >> eg[i] >> cg[i];
}
f.close();
}
void solve()
{
for(int i=1; i<=n; ++i)
{
for(int k=0; k<=gen; ++k)
{
if(eg[i]<=k)
ener[i][k] = max(ener[i-1][k], ener[i-1][k-eg[i]] + cg[i]);
}
}
}
void out()
{
ofstream g("energii.out");
g << ener[n][gen] << '\n';
g.close();
}
int main()
{
read();
solve();
out();
return 0;
}