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#include <bits/stdc++.h>
using namespace std;
int w[6000],p[6000],dp[6000][10009];
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int main()
{
int g,n;
in>>n>>g;
for(int i=1;i<=n;i++)
in>>w[i]>>p[i];
dp[1][w[1]]=p[1];
for(int i=2;i<=n;i++)
for(int s=w[i];s<=g;s++)
{ dp[i][s]=dp[i-1][s];
if(s==w[i])dp[i][s]=max(dp[i][s],p[i]);
if(dp[i-1][s-w[i]])
dp[i][s]=max(dp[i][s],dp[i-1][s-w[i]]+p[i]);
}
out<<dp[n][g];
return 0;
}