Figure out the smallest sum of numbers that are made out of the number cards 1, 4, 9, and 5 using only once.
1 4 [OP_ADD] 9 [OP_ADD] 5 [OP_ADD]
var_a = 1
var_b = 4
var_c = var_a + var_b
var_d = 9
var_e = var_c + var_d
var_f = 5
var_g = var_e + var_f
print(int(var_g))