#include <bits/stdc++.h>

using namespace std;

const int N = 1010;

int n, m;
int w[N];  //占用的时间
int v[N];  //销售的价格
int f[N][N];

int main() {
    //物品个数n
    cin >> n >> m;
    //读入重量和价值
    for (int i = 1; i <= n; i++) cin >> w[i] >> v[i];

    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= m; j++)
            if (j >= w[i]) f[i][j] = max(f[i - 1][j], f[i - 1][j - w[i]] + v[i]); //两种情况取最大值
            else f[i][j] = f[i - 1][j];

    cout << f[n][m] << endl;
    return 0;
}