C :

#include<stdio.h>
int times;
void dsf(int num)
{
     int i=0;
     if(num!=0){
    while(1)
    {

       if((i*i+i)/2>num){
       times=times+i-1;
       num=num-((i-1)*(i-1)+(i-1))/2;
       break;
       }
	   i++;
          
            } 
	dsf(num);   
	}
}
int main()
{
    int num;
    
    while(scanf("%d",&num)!=EOF){
    times=0;
    dsf(num);
    printf("%d\n",times);
    }
    return 0;
}

C++ :

#include <iostream>
using namespace std;
int main()
{
	int n,c=0;
	cin>>n;
	while(n)
	{
		int i=1;
		while(n>=i)
		{
			n-=i;
			c++;
			i++;
		}
	}
	cout<<c<<endl;
	return 0;
}