When Yuna surveyed her classmates, 27 students said they liked math, but 28 students said they liked Korean. When 22 of the friends who said they liked math said they also liked Korean, how many students answered Yuna's question?
28 27 [OP_ADD] 22 [OP_SUB]
var_a = 28
var_b = 27
var_c = var_a + var_b
var_d = 22
var_e = var_c - var_d
print(int(var_e))