#include <iostream>
#define ll long long

using namespace std;

int main () {
ll t;
cin>>t;
while (t--){
ll k,n;
ll cnt=0;
cin>>k>>n;
ll n2=n;
for (int i=1;i<=k;i++){
if (n-i>=0){
n-=i;
cnt++;
}else
break;
}
for (int i=1;i<=n2;i++){
if (n2-i>=0){
n2-=i;
cnt++;
}else
break;
}
cout << cnt;
}
}