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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,g,i,j,t;
pair <int,int> v[5005];
int dp[5][10005];
int main()
{
fin>>n>>g;
for(i=1;i<=n;i++)
{
fin>>v[i].first>>v[i].second;
}
for(i=1;i<=n;i++)
{
t=i%2;
for(j=1;j<=g;j++)
{
dp[t][j]=dp[1-t][j];
if(v[i].first<=j)
dp[t][j]=max(dp[1-t][j],dp[1-t][j-v[i].first]+v[i].second);
}
}
fout<<dp[t][g];
return 0;
}