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#include <bits/stdc++.h>
using namespace std;
ifstream in ("rucsac.in");
ofstream out ("rucsac.out");
const int NMAX=5005,GMAX=10005;
int n,g;
struct pereche
{
int greutate,profit;
} v[NMAX];
int dp[2][GMAX];
int fin;
int main()
{
in>>n>>g;
for(int i=1; i<=n; i++)
{
in>>v[i].greutate>>v[i].profit;
}
int linie=0;
for(int i=1; i<=n; i++,linie=1-linie)
{
for(int j=0; j<=g; j++)
{
dp[1-linie][j]=dp[linie][j];
if(v[i].greutate<=j)
{
dp[1-linie][j]=max(dp[1-linie][j],dp[linie][j-v[i].greutate]+v[i].profit);
}
}
}
for(int i=1; i<=g; i++)
{
fin=max(fin,dp[linie][i]);
}
out<<fin;
return 0;
}