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#include <bits/stdc++.h>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n,k,m,x,y,i;
long long v[50001];
void rucs(int p1,int p)
{
for (i=k;i>=0;i--)
{
if (v[i]!=-1)
{
if (v[i+p1]<v[i]+p)
v[i+p1]=p+v[i];
}
}
}
int cmp()
{
for(i=1;i<=k;i++)
if(v[i]>m)
m=v[i];
return m;
}
int main()
{
f>>n>>k;
for(i=1;i<=k;i++)
v[i]=-1;
for(i=0;i<n;i++)
{
f>>x>>y;
rucs(x,y);
}
g<<cmp();
return 0;
}