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#include <bits/stdc++.h>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n,gg,gr[5009],pr[5009],v1[5005],v2[5005];
int main()
{
f>>n>>gg;
for(int i=1;i<=n;i++)
{
f>>gr[i]>>pr[i];
}
for(int i=1;i<=n;i++)
{
for(int j=1;j<=gg;j++)
{
if(gr[i]>j)
v2[j]=v1[j];
else
v2[j]=max(v1[j],v1[j-gr[i]]+pr[i]);
}
for(int j=1;j<=gg;j++)
{
v1[j]=v2[j];
v2[j]=0;
}
}
g<<v1[gg];
return 0;
}