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#include <fstream>
using namespace std;
int n, G, p[5000], g[5000];
int dp[3][10001];
void rucsac()
{
for(int i = 0; i < n; i++){
for(int j = 0; j <= G; j++)
if (j < g[i])
dp[(i + 1) % 2][j] = dp[i % 2][j];
else
dp[(i + 1) % 2][j] = max(dp[i % 2][j], p[i] + dp[i % 2][j - g[i]]);
}
}
int main()
{
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
fin >> n >> G;
for(int i = 0; i < n; i++) {
fin >> g[i];
fin >> p[i];
}
rucsac();
fout << dp[n % 2][G];
fin.close();
fout.close();
return 0;
}