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#include <bits/stdc++.h>
using namespace std;
ifstream fin("energii.in");
ofstream fout("energii.out");
int uz[10001][10001],cmax[1001],wmax,gen;
int g[1001],w[1001];
int main()
{
fin>>gen>>wmax;
int i;
for(i=1;i<=gen;i++)
fin>>g[i]>>w[i];
int s;
for(s=1;s<=wmax;s++) cmax[s]=-1;
for(s=1;s<=wmax;s++)
for(i=1;i<=gen;i++)
if(g[i]<=s && cmax[s-g[i]]!=-1 && uz[s-g[i]][i]==0)
{
cmax[s]=max(cmax[s],w[i]+cmax[s-g[i]]);
uz[s][i]=1;
}
fout<<cmax[wmax];
return 0;
}