#include <iostream>
#include <vector>
using namespace std;
int main(int argc, char* argv[])
{
	int N,k=1;
	cin>>N;
	vector<int> myVec;
	
	while (true){
		int K=k*(k+1)/2;
		if (K<=N){
			myVec.push_back(K);
			k++;
		}else{
			break;
		}
	}
	int num=0;
	for (k=myVec.size()-1;k>=0;k--){
		if (N>=myVec[k]){
			num+=N/myVec[k];
			N=N%myVec[k];
		}
	}
	cout<<num<<endl;
	return 0;
}