#include <iostream>
#include <list>

int main()
{
    int n;
    std::cin >> n;
    
    std::list<int> coins;
    for(int i = 1;; i++)
    {
        int val = (i * (i + 1)) / 2;
        
        if(val <= n)
            coins.push_back(val);
        else
            break;
    }
    
    int count = 0;
    int sum = 0;
    for(auto i = coins.rbegin(); i != coins.rend(); i++)
    {
        while(1)
        {
            if((n - sum) >= *i)
            {
                sum += *i;
                count++;
            }
            else
            {
                break;
            }
        }
        
        if(sum == n)
            break;
    }
    
    std::cout << count << std::endl;
    
    return 0;
}