To go to school, Woojun walked 1/5 of the total distance and took the subway for the remaining distance. How many times is the total distance taken by subway?
1 1/5 [OP_SUB]
var_a = 1
var_b = 0.2
var_c = var_a - var_b
print('{:.2f}'.format(round(var_c+1e-10,2)))