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#include <iostream>
#include<fstream>
using namespace std;
int d[5005][10005],n,m,i,j,g,p[5005],w[5005],y,x;
int main()
{
ifstream in("rucsac.in");
ofstream out("rucsac.out");
in>>n>>g;
for(i=1;i<=n;i++)
{
in>>w[i]>>p[i];
}
for(i=1;i<=n;i++)
{
for(j=1;j<=g;j++)
{
if(i%2==0)
{
if((j-w[i])<0)
{
y=0;
x=0;
}
else
{
y=j-w[i];
x=p[i];
}
d[2][j]=max(d[1][j], d[1][y]+x);
}
else
{
if((j-w[i])<0)
{
y=0;
x=0;
}
else
{
y=j-w[i];
x=p[i];
}
d[1][j]=max(d[2][j], d[2][y]+x);
}
}
}
int s=max(d[1][g],d[2][g]);
out<<s;
}