#include<bits/stdc++.h>

#define int long long

using namespace std;

signed main(){
    int t;
    cin >> t;
    while(t--) {
        int a, b, c;
        cin >> a >> b >> c;
        if(c == 0){
            cout << -1 << '\n';
        }else if(a == 0){
            if(b == 0 && c == 1){
                cout << 0 << '\n';
            }else if(b > 0 && c == 1){
                cout << b << '\n';
            }else{
                cout << -1 << '\n';
            }
        }else if(b == 0){
            if(a + 1 == c){
                cout << a << '\n';
            }else{
                cout << -1 << '\n';
            }
        }else{
            if(a + 1 == c){
                if(b == 1){
                    cout << a << '\n';
                }else {
                    int h = 1, floor = 1;
                    while (true) {
                        if (a - floor >= 0) {
                            a -= floor;
                            floor *= 2;
                            h++;
                        } else {
                            break;
                        }
                    }
                    b = b - (floor - a);
                    while (true) {
                        b -= floor;
                        h++;
                        if (b < 0) {
                            break;
                        }
                    }
                    cout << h << '\n';
                }
            }else{
                cout << -1 << '\n';
            }
        }
    }
}