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#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int a[3][10005],G,i,j,n,gr[10005],v[10005];
int main()
{
int l=0;
f>>n>>G;
for(i=1;i<=n;i++)
{
f>>gr[i]>>v[i];
}
for(i=1;i<=n;i++, l=1-l)
{for(j=0;j<=G;j++)
{
a[1-l][j]=a[l][j];
if(gr[i]<=j) a[1-l][j]=max(a[1-l][j],a[l][j-gr[i]]+v[i]);
}
}
g<<a[l][G];
return 0;
}