When 13 is divided by 7, the quotient is 1 and the remainder is A. Find the value of A at this time.
13 7 1 [OP_MUL] [OP_SUB]
var_a = 13
var_b = 7
var_c = 1
var_d = var_b * var_c
var_e = var_a - var_d
print(int(var_e))