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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[GMAX];
int fin;
int main()
{
in>>n>>g;
for(int i=1; i<=n; i++)
{
in>>v[i].greutate>>v[i].profit;
}
for(int i=0; i<=g; i++)
dp[i]=INT_MIN;
dp[0]=0;
for(int i=1; i<=n; i++)
for(int j=g; j>=0; j--)
{
if(j>=v[i].greutate)
dp[j]=max(dp[j],dp[j-v[i].greutate]+v[i].profit);
}
for(int i=0; i<=g; i++)
{
fin=max(fin,dp[i]);
}
out<<fin;
return 0;
}