The susceptible exposed infected resistant model is a classic compartmental model where N is the population size. S is the number of people who are susceptible, I is the number of people who have been infected and R is the number of people who are resistant. In the COVID-19 pandemic, due to the small death rate, the number of people who died are also counted as people who are resistant. During the time of this study and the timescale of the model, it was assumed that people who were infected and recovered would not be counted in the susceptible group again.