#include <bits/stdc++.h>
using namespace std;
int v[1005], p[1005],f[1005];
int main(){
    int n, m;
    cin >> n >> m;
    for (int i = 1; i <= n; i++) cin >> v[i] >> p[i];
    for (int i = 1; i <= n; i++){
        for (int j = m; j >= v[i]; j--){
            f[j] = max(f[j], f[j - v[i]] + p[i]);
        }
    }
    cout << f[m];
    return 0;
}