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#include <fstream>
#include <iostream>
using namespace std;
long long int n,g,w[5001],p[5001],cost[5001][10001],maxim;
int main()
{
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int i,j;
in>>n>>g;
for(i=1; i<=n; i++)
{
in>>w[i]>>p[i];
}
for(i=1; i<=n; i++)
{
for(j=0; j<=g; j++)
{
if(j+w[i]<=g)
if(cost[i-1][j+w[i]]<cost[i-1][j]+p[i] )
{
cost[i][j+w[i]]=p[i]+cost[i-1][j];
if(cost[i][j+w[i]]>maxim)
maxim=cost[i][j+w[i]];
}
else
{
cost[i][j+w[i]]=cost[i-1][j+w[i]];
}
}
}
out<<maxim;
in.close();
out.close();
return 0;
}