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#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int N,G,w[50005],p[10005],dp[5005][10005];
int main()
{
fin>>N>>G;
for(int i=1; i<=N; i++)
fin>>w[i]>>p[i];
for(int i=1; i<=N; i++)
for(int j=1; j<=G; j++)
{
if(j>=w[i])
dp[i][j]=max(dp[i-1][j],dp[i-1][j-w[i]]+p[i]);
else
dp[i][j]=dp[i-1][j];
}
fout<<dp[N][G];
fin.close();
fout.close();
return 0;
}