#include <fstream>
#define maxn 5001
#define maxg 10001

using namespace std;

int W[maxn], P[maxn];
int Optim[maxg];

int main() {
	ifstream fin("rucsac.in");
	ofstream fout("rucsac.out");
	int N, G;
	fin>>N>>G;

	for(int i = 1; i <= N; ++i) {
		fin>>W[i]>>P[i];
	}

	Optim[0] = 0;
	int sol = 0;

	for(int i = 1; i <= N; ++i)
		for(int j = G - W[i]; j >= 0; --j) {
			if(Optim[j+W[i]] < Optim[j] + P[i]) {
				Optim[j+W[i]] = Optim[j] + P[i];
				if(Optim[j+W[i]] > sol)
					sol = Optim[j+W[i]];
			}
		}
	fout<<sol;
	return 0;
}