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#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int j,i,gmax,gg,n,p,Max;
long long a[10003];
int main()
{
f>>n>>gmax>>gg>>p;
if(gg<=gmax) a[gg]=p;
for(j=1; j<n; ++j)
{
f>>gg>>p;
for(i=gmax-gg; i>=0; --i)
if(a[i]>0)
{
if(a[i+gg]==0) a[i+gg]=a[i]+p;
else if(a[i+gg]<a[i]+p) a[i+gg]=a[i]+p;
}
if( a[gg]==0) a[gg]=p;
else if(a[gg]<p) a[gg]=p;
}
Max=0;
for(i=0; i<=gmax; ++i) if(Max<a[i]) Max=a[i];
g<<Max<<'\n';
return 0;
}