#include<bits/stdc++.h>
using namespace std;
int main()
{
    int m;
    cin>>m;
    int s=0,n=1;
    while(s<=m)
    {
        s+=n;
        n++;
    }
    n--;
    cout<<n;
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int m;
	cin>>m;
	int s=0;
	int n=1;
	while(s+n<=m)
	{
		s+=n;
		n++;
	}
	cout<<n;
	return 0; 
}

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A AAA