> 
> 
> #include<iostream>
> using namespace std;
> int main()
> {
> 	int i,m,s;
> 	while(cin>>m)
> 	{
> 		s=0;
> 		for(i=1;s<m;i++)
> 		s+=i;
> 	    if((s-m)%2==0)
> 			cout<<(i-1)<<endl;
> 		else 
> 			cout<<(i+1)<<endl;
> 	
> 	}
> 	return 0;
> }
> 
> 
> 
> 
>