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#include <bits/stdc++.h>
#define N 5001
#define X 10001
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n, s, p, g;
int a[X], a1[X], a2[X];
void citire()
{
fin >> n >> g;
for(int i=1; i<=n; i++)
fin >> a1[i] >> a2[i];
}
void alg()
{
for(int i=1; i<=n; i++)
{
for(int j=g-a1[i]; j>=0; j--)
{
if(a[j+a1[i]]<a[j]+a2[i])
{
a[j+a1[i]]=a[j]+a2[i];
if(a[j+a1[i]]>s)
{
s=a[j+a1[i]];
}
}
}
}
}
int main()
{
citire();
alg();
fout << s;
return 0;
}