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#include <fstream>
#define NM 5005
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
struct obiect { int v, g; };
obiect V[NM];
int n, m, M[2][10000];
int main()
{
int i, j;
fin >> n >> m;
for (i = 1; i <= n; i++)
{
fin >> V[i].g >> V[i].v;
}
for (i = 1; i <= n; i++)
{
for (j = 0; j <= m; j++)
{
if (j - V[i].g >= 0)
{
M[1][j] = M[0][j - V[i].g]+V[i].v;
}
if (j >= 1)
M[1][j] = M[1][j] > M[1][j - 1] ? M[1][j] : M[1][j - 1];
M[1][j] = M[1][j] > M[0][j] ? M[1][j] : M[0][j];
}
for (j = 0; j <= m; j++)
{
M[0][j] = M[1][j];
}
}
fout << M[0][m];
return 0;
}