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#include<fstream>
#define NMAX 5001
using namespace std;
int P[NMAX],G[NMAX];
int cost[2*NMAX];
int main()
{
int n,gr,i,j,sol=0;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
f>>n>>gr;
for(i=1;i<=n;i++)
f>>G[i]>>P[i];
for(i=1;i<=n;i++)
for(j=gr-1;j>=0;j--)
if(cost[j+G[i]]<cost[j]+P[i] && j+G[i]<=gr)
{
cost[j+G[i]]=cost[j]+P[i];
if(cost[j+G[i]]>sol)
sol=cost[j+G[i]];
}
g<<sol;
f.close();
g.close();
}