An automatic testing process takes samples of ore from mining companies and subjects them to four sequential tests. The reliability of the four different test machines that perform the tasks is different. The first test machine has a reliability of 0.99, the second has a reliability of 0.92, the third has a reliability of 0.98 and the fourth a reliability of 0.95. If one of the machines stops working, the total process will stop. What is the reliability of the total process?