How would i be able to find the max value in a loop?

Im trying to find a maximum profit for a apartment complex. I used a loop to find all the different profits, but I need to find the maximum value of profit. How would I be able to find the max profit ? Should I be using a loop or another way to do this ? Im still new to coding, help is very appreciated.

#include <iostream>

using namespace std;

int main()
{
    // Containers for all variables
    int units;
    int rent;
    int incrent;
    int maintain;
    int profit;

    // User input
    cout << "How many units are being rented: ";
    cin >> units;
    cout << "How much is rent for each occupied room: $";
    cin >> rent;
    cout << "How much will rent need to increase for someone to leave: $";
    cin >> incrent;
    cout << "How much money does it cost to maintain a occupied room: $";
    cin >> maintain;
    //cout << "At max units rented you make $" << units * rent - maintain << endl;

    //Profit calculations
    while(units >= 0)
    {
    cout << "While at " << units << " rented you make $" << (units * rent) - (maintain * units) << endl;
    
    rent = rent + incrent;
    units--;
    }