#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;
using vl = vector<ll>;
#define rep(i, n) for(ll i = 0;i < n;i++)
#define all(i) i.begin(), i.end()
template<class T, class U> bool cmax(T& a, U b) { if (a<b) {a = b; return true;} else return false; }
template<class T, class U> bool cmin(T& a, U b) { if (a>b) {a = b; return true;} else return false; }

int main() {
  cin.tie(0); ios::sync_with_stdio(false);

  ll n;
  cin >> n;
  vl a(n), b(n), c(n);
  rep(i, n) {
    cin >> a[i] >> b[i] >> c[i];
  }

  rep(i, n) {
    if (b[i] < 3) {
      cout << -1 << endl;
      continue;
    }
    ll cnt = 0;
    if (a[i] >= b[i]) {
      cnt += a[i]-(b[i]-1);
      a[i] = b[i]-1;
    }
    if (c[i] >= b[i]) {
      cnt += c[i]-(b[i]-1);
      c[i] = b[i]-1;
    }

    if (a[i] == c[i]) {
      cnt++;
    }
    cout << cnt << endl;
  }
}