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#include <fstream>
using namespace std;
const int Gmax = 10000;
int dp[2][Gmax + 1];
int main()
{
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n, G, w, p;
fin >> n >> G;
for(int i = 0; i < n; i++){
fin >> w >> p;
for(int j = 0; j <= G; j++){
dp[i & 1][j] = dp[(i - 1) & 1][j];
if(w <= j){
dp[i % 2][j] = max(dp[(i - 1) & 1][j], dp[(i - 1) & 1][j - w] + p);
}
}
}
fout << dp[!(n & 1)][G];
return 0;
}