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#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int dp[10001][10001];
int n, k, g, s;
int main()
{
fin>>n>>k;
fin>>g>>s;
for(int i=g;i<=k;i++)
dp[1][i]=s;
for(int i=2;i<=n;i++)
{
fin>>g>>s;
for(int j=1;j<=k;j++)
if(j>=g)
dp[i][j]=max(dp[i-1][j],s+dp[i-1][j-g]);
else dp[i][j]=dp[i-1][j];
}
fout<<dp[n][k];
return 0;
}