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#include <iostream>
#include <fstream>
#define MAXN 5001
#define MAXG 10001
using namespace std;
int a,n,gr,greutate[MAXN],profit[MAXN],pmax[2][MAXG],profmax,ic,ip;
int main()
{
ifstream f ("rucsac.in");
ofstream g ("rucsac.out");
f>>n>>gr;
for(int i=1;i<=n;i++)
f>>greutate[i]>>profit[i];
for(int i=1;i<=n;i++)
for(int j=gr;j>=1;j--){
ic=i%2;ip=(i-1)%2;
if(j>=greutate[i])pmax[ic][j]=max(pmax[ip][j],pmax[ip][j-greutate[i]]+profit[i]);
else pmax[ic][j]=pmax[ip][j];
}
for(int i=1;i<=gr;i++)
profmax=max(profmax,pmax[n%2][i]);
g<<profmax;
f.close ();
g.close ();
return 0;
}