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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,g,ans;
int gr[5005];
int pr[5005];
int dp[10005];///profitul maxim pe care il putem obtine din primele i elemente fara sa depasim greutatea w
int main()
{
fin>>n>>g;
for(int i=1;i<=n;i++)
fin>>gr[i]>>pr[i];
dp[0]=1;
for(int i=1;i<=n;i++)
for(int w=g-gr[i];w>=0;w--)
if(dp[w])
{
dp[w+gr[i]]=max(dp[w+gr[i]],dp[w]+pr[i]);
ans=max(ans,dp[w+gr[i]]);
}
fout<<ans-1;
return 0;
}