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#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
const int nmax = 5005, gmax = 10005;
int n, g, i, j, w[nmax], p[nmax], dp[2][gmax];
bool k;
int main()
{
fin >> n >> g;
for(i=1; i<=n; i++)
fin >> w[i] >> p[i];
for(i=1; i<=n; i++) {
k=!k;
for(j=1; j<w[i]; j++)
dp[k][j]=dp[!k][j];
for(j=w[i]; j<=g; j++)
dp[k][j]=max(dp[!k][j], dp[!k][j-w[i]]+p[i]);
}
fout << dp[k][g];
return 0;
}