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#include<algorithm>
#include<fstream>
#include<cassert>
#include<vector>
#define pii pair<int,int>
#define vi vector<int>
#define fi first
#define se second
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int dp[10001];
int main(){
int n , g , w , p , l;
fin >> n >> g;
for(int i = 1 ; i <= n ; ++ i){
fin >> w >> p;
for(int j = l ; j >= 0 ; -- j){
if(!j || (dp[j] && j + w <= g)){
dp[j + w] = max(dp[j + w] , dp[j] + p);
}
}
l += w;
}
fout << *max_element(dp + 1 , dp + 1 + g) << '\n';
return 0;
}