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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
const int Nmax=5005;
struct el{
int w;
int p;
};
el a[Nmax];
int dp[2*Nmax];
int main()
{
ios_base::sync_with_stdio(false);
fin.tie(NULL);
fout.tie(NULL);
int n,g;
fin>>n>>g;
for(int i=1;i<=n;i++)
{
fin>>a[i].w>>a[i].p;
}
for(int i=1;i<=n;i++)
{
for(int j=g;j>=a[i].w;j--)
{
dp[j]=max(dp[j-a[i].w]+a[i].p,dp[j]);
}
}
fout<<dp[g]<<'\n';
return 0;
}