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#include <bits/stdc++.h>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,gr;
int g[5001],p[10001];
int dp[5001][10001];
void citire()
{
fin>>n>>gr;
for(int i=1;i<=n;i++)
fin>>g[i]>>p[i];
}
void construire_matrice()
{
for(int i=1;i<=n;i++)
{
for(int j=1;j<=gr;j++)
{
if(g[j]<=j)
dp[i][j]=max(dp[i-1][j],dp[i-1][j-g[i]]+p[i]);
}
}
fout<<dp[n][gr]<<"\n";
}
int main()
{
citire();
construire_matrice();
return 0;
}