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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n,G,i,w[5000],p[5000],first[10000],last[1000],j,k;
int main()
{
f>>n>>G;
for(i=1;i<=n;i++)
{
f>>w[i]>>p[i];
}
for(i=1;i<=n;i++)
{
for(j=0;j<=G;j++)
{
if(w[i]<=j)
last[j]=max(first[j] , first[j-w[i]] + p[i] ) ;
else
last[j]=first[j];
}
for(k=0;k<=G;k++) first[k]=last[k];
}
g<<last[G]<<' '<<endl;
}