#include <fstream>
using namespace std;
int g[100005], p[100005];
int s[100005];
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
int main(){
    int n, w, r = -1;
    cin >> n >> w;
    for(int i = 1; i <= n; i ++){
        cin >> g[i] >> p[i];
    }
    for(int i = 1; i <= n; i ++){
        for(int j = w - g[i]; j >= 0; j --){
            s[j + g[i]] = max(s[j + g[i]], s[j] + p[i]);
            r = max(r, s[j + g[i]]);
        }
    }
    cout << r;
}