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#include <fstream>
#define GMAX 10004
using namespace std;
ifstream fin ("rucsac.in");
ofstream fout ("rucsac.out");
int dp[GMAX][2];
int n, G, col, w, p, i, j;
int main()
{
fin>>n>>G;
for (i=1; i<=n; i++)
{
fin>>w>>p;
for (j=0; j <= G; j++)
if (j-w >= 0)
dp[j][col]=max(dp[j-w][1-col]+p, dp[j][1-col]);
else
dp[j][col]=dp[j][1-col];
col=1-col;
}
fout<<dp[G][1-col];
return 0;
}