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#include <bits/stdc++.h>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n,G,a[3][10005];
pair <int,int> v[5005];
int main()
{
f>>n>>G;
for(int i=1; i<=n; i++)
f>>v[i].first>>v[i].second;
for(int i=1,k=1; i<=n; i++,k++)
{
for(int j=1; j<=G; j++)
{
if(v[i].first<=j)
a[k][j]=max(a[k-1][j],a[k-1][j-v[i].first]+v[i].second);
else
a[k][j]=a[k-1][j];
}
if(k==2)
{
for(int j=1; j<=G; j++)
a[k-1][j]=a[k][j];
k--;
}
}
g<<a[2][G];
return 0;
}