#include <bits/stdc++.h>

using namespace std;
const int N = 1010;

int n, m;
int v[N], w[N];
int f[N];

int main() {
    //物品个数n
    cin >> n >> m;      //m:背包容积，就是大V
    for (int i = 1; i <= n; i++) cin >> w[i] >> v[i];

    for (int i = 1; i <= n; i++)
        for (int j = m; j >= w[i]; j--)
            f[j] = max(f[j], f[j - w[i]] + v[i]);
    cout << f[m] << endl;
    return 0;
}