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