A person in the Civil Service Retirement System can retire at age 55 with at least 20 years of service.

A simplified variation of the computation of the amount of their pension as follows:

Calculate the average annual salary for the persons best three years; call it ave.

Calculate number of months divided by 12 and call it yrs.

Calculate the percentage rate: 1.5% for the first five years, 1.75 for the next five years, 2% for each additional year. Call it perRate.

Take the minimum of perRate and 80%; call it p.

The amount of the pension is p*ave.

Write a python program that requests the inputs as shown in below figure, and calculates the amount of the pension.