A total of 20 students are running a race. 11 students reached the finish line before Yoongi. How many students came later than Yoongi?
20 11 [OP_SUB] 1 [OP_SUB]
var_a = 20
var_b = 11
var_c = var_a - var_b
var_d = 1
var_e = var_c - var_d
print(int(var_e))