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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[NMAX][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=1; i<=n; i++)
for(int j=1; j<=g; j++)
{
dp[i][j]=INT_MIN;
}
for(int i=1; i<=n; i++)
{
for(int j=v[i].greutate; j<=g; j++)
{
if(dp[i-1][j]<dp[i-1][j-v[i].greutate]+v[i].profit)
dp[i][j]=dp[i-1][j-v[i].greutate]+v[i].profit;
else
dp[i][j]=dp[i-1][j];
}
}
/*for(int i=1; i<=n; i++)
for(int j=1; j<=g; j++)
{
fin=max(fin,dp[i][j]);
}*/
out<<dp[n][g];
return 0;
}