17:1

#include<bits/stdc++.h>
#define ll long long
using namespace std;
ll function_value(ll n)
{
    return (n*(n+1))/2;
}
ll find_num(ll y)
{
    ll l=1,r=100000;
    bool flg=0;
    while(l<=r)
    {
        ll mid=(l+r)/2;
        if(function_value(mid)==y)
        {
            flg=1;
            return mid;
        }
        else if(function_value(mid)<y)
        {
            l=mid+1;
        }
        else r=mid-1;

    }
    if(flg==0) return -1;

}
int main()
{
    int t;
    cin>>t;
    while(t--)
    {
        ll y;
        cin>>y;
        if(find_num(y)==-1) cout<<"NAI\n";
        else cout<<find_num(y)<<"\n";
    }
}