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#include 
#include
#include
#include
#include
using namespace std;
typedef long long ll;
ll dp[105][100005];
int main()
{
    int n, W;
    cin >> n >> W;
    vector weight(n), value(n);
    for(int i = 0; i < n; i++) {
        cin >> weight[i] >> value[i];
    }
    for(int i = 0; i <= n; i++) {
        for(int j = 0; j <= W; j++) {
            dp[i][j] = -1e18;
        }
    }
    dp[0][W] = 0;
    for(int i = 0; i < n; i++) {
        for(int j = W; j >= 0; j--) {
            dp[i + 1][j] = max(dp[i + 1][j], dp[i][j]);
            if(j - weight[i] >= 0) {
                dp[i + 1][j - weight[i]] = max(dp[i + 1][j - weight[i]], dp[i][j] + value[i]);
            }
        }
    }
    ll result = 0;
    for(int j = 0; j <= W; j++) {
        result = max(result, dp[n][j]);
    }
    cout << result << endl;
    return 0;
}