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#include <bits/stdc++.h>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
const int lim=1e4+10;
int n,g,i,w[lim],p[lim],dp[lim][lim],k,mx;
int main()
{
fin>>n>>g;
for(i=1;i<=n;i++)
{
fin>>w[i]>>p[i];
}
for(i=1;i<=n;i++)
dp[w[i]][1]=max(dp[w[i]][1],p[i]);
for(i=1;i<=n;i++)
for(k=1;k<=g;k++)
{
if(k<w[i])dp[k][i]=dp[k][i-1];
else dp[k][i]=max(dp[k][i-1],p[i]+dp[k-w[i]][i-1]);
}
for(i=1;i<=n;i++)
mx=max(mx,dp[g][i]);
fout<<mx;
return 0;
}