#include<fstream>
#define e endl
#define FOR(a,b,c) for(int a=(b); a<(c); ++a)
#define TO(a,b) for(int a=0; a<(b); ++a)
using namespace std;

					fstream f("rucsac.in");
					ofstream t("rucsac.out");
					
													int N, G, S;
													int W[5001], P[5001], Q[10001];
int main(){
	
	f>>N>>G;
	
	for(int i=1; i<=N; ++i){
		f>>W[i]>>P[i];
	}
	
	Q[0] = 0;
    S = 0;
     
    for( int i = 1; i <= N; ++i)
        for( int j = G - W[i]; j >= 0; --j) {
            if( Q[j+W[i]] < Q[j] + P[i] )
            {
                Q[j+W[i]] = Q[j] + P[i];
                if( Q[j+W[i]] > S)
                    S = Q[j+W[i]];
            }
        }

	t<<S;
	
	return 0;
}