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#include <fstream>
#define nmax 5005
using namespace std;
fstream f1("rucsac.in", ios::in);
fstream f2("rucsac.out", ios::out);
int n, gmax, gr[nmax], p[nmax], pmax[nmax];
void citire()
{
int i;
f1>>n>>gmax;
for(i=1; i<=n; i++)
f1>>gr[i]>>p[i];
}
void rucsac()
{
int i, g;
for(i=1; i<=n; i++)
for(g=gmax; g>=gr[i]; g--)
if(pmax[g]< pmax[g-gr[i]]+p[i])
pmax[g]=pmax[g-gr[i]]+p[i];
f2<<pmax[gmax];
}
int main()
{
citire();
rucsac();
return 0;
}