I want Long Long Salary

#include <bits/stdc++.h>
using namespace std;
#define ul unsigned long long int

ul findlcm(vector<ul> salaries, ul size)
{
    ul lcm = salaries[0];

    for (int i = 1; i < size; i++)
    {
        lcm = (((salaries[i] * lcm)) /
               (gcd(salaries[i], lcm)));
    }

    return lcm;
}

int main()
{
    int t;
    cin >> t;

    while (t--)
    {
        ul size, startingSalary;
        cin >> size >> startingSalary;
        vector<ul> salaries;

        for (ul i = 0; i < size; i++)
        {
            int temp;
            cin >> temp;
            salaries.push_back(temp);
        }

        salaries.push_back(startingSalary);

        ul common = findlcm(salaries, size + 1);

        cout << (common / startingSalary) - 1 << endl;
    }
}