C :

#include <stdio.h>

int main()
{
    int n,t=0;
    int num = 1;
    scanf("%d",&n);
    while(n)
    {
        if(n<num)
            num = 1;
        n -= num;
        ++num;
        ++t;
    }
    printf("%d\n", t);
    return 0;
}

C++ :

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