Multiplying the grandson's age by 6 equals the grandfather's age. After 4 years, the ages of grandfather and grandson add up to be 78. How old is the grandson now?
78 4 2 [OP_MUL] [OP_SUB] 1 6 [OP_ADD] [OP_DIV]
var_a = 78
var_b = 4
var_c = 2
var_d = var_b * var_c
var_e = var_a - var_d
var_f = 1
var_g = 6
var_h = var_f + var_g
var_i = var_e / var_h
print(int(var_i))