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#include <bits/stdc++.h>
#define nMax 5005
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n, g, sol, w[nMax], p[nMax], dp[nMax];
int main()
{
fin >> n >> g;
for(int i=1; i<=n; i++)
fin >> w[i] >> p[i];
for(int i=1; i<=n; i++)
for(int j=g-w[i]; j>=0; j--)
if(dp[j+w[i]]<dp[j]+p[i])
{
dp[j+w[i]]=dp[j]+p[i];
sol=max(sol, dp[j+w[i]]);
}
fout << sol;
return 0;
}