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#include <iostream>
#include <fstream>
using namespace std;
const int Nmax = 5005;
const int Gmax = 10005;
int N, G;
int A[3][Gmax];
pair<int,int> ob[Nmax];
void read()
{
ifstream f("rucsac.in");
f >> N >>G;
for(int i = 1; i <= N; i ++)
{
f >> ob[i].first;
f >> ob[i].second;
}
f.close();
}
int max(int x, int y)
{
if(x >= y)
{
return x;
}
return y;
}
void solve()
{
for(int i = 1; i <= N; i ++)
{
for(int j = 1; j <= G; j ++)
{
if(ob[i].first <= j)
{
A[2][j] = max(A[1][j], A[1][j-ob[i].first]+ob[i].second);
}
}
for(int j = 1; j <= G; j ++)
{
A[1][j] = A[2][j];
}
}
}
void print()
{
ofstream g("rucsac.out");
g << A[2][G];
g.close();
}
int main()
{
read();
solve();
print();
return 0;
}