Among the 45 students, 42 students raised their hands to say they like art, and 40 students raised their hands to say they like science. If all students participated in the survey, how many students raised their hands in both subjects?
40 42 [OP_ADD] 45 [OP_SUB]
var_a = 40
var_b = 42
var_c = var_a + var_b
var_d = 45
var_e = var_c - var_d
print(int(var_e))