#include 
#include 
using namespace std;

long long 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 < 101; i++) {
        for(int j = 0; j < 100001; j++) {
            dp[i][j] = -1e18;
        }
    }
    
    dp[0][W] = 0;
    for(int i = 0; i < n; i++) {
        for(int w = W; w >= 0; w--) {
            if(w - weight[i] >= 0) {
                dp[i + 1][w - weight[i]] = max(dp[i + 1][w - weight[i]], dp[i][w] + value[i]);
            }
            dp[i + 1][w] = max(dp[i + 1][w], dp[i][w]);
        }
    }
    long long result = -1e18;
    for(int i = 0; i <= W; i++) {
        result = max(result, dp[n][i]);
    }
    cout << result << endl;
    return 0;
}