#include <fstream>
 
using namespace std;
 
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
 
int n, wtMax, w[5005], v[5005], dp[10005];
 
int main() {
    fin >> n >> wtMax;
    for(int i = 1; i <= n; i++) {
        fin >> w[i] >> v[i];
    }
    int wt = 0;
    for(int i = 1; i <= n; i++) {
        for(int j = wtMax - w[i]; j >= 0; j--) {
            if(dp[j + w[i]] < dp[j] + v[i]) {
                dp[j + w[i]] = dp[j] + v[i];
                wt = max(wt, dp[j + w[i]]);
            }
        }
    }
    fout << wt;
    return 0;
}