To make a paper string, 6 sheets of paper were overlapped by 7 centimeters (cm) and glued. This piece of paper has the shape of a square with each side measuring 30 centimeters (cm). Find the area of the string made.
30 6 [OP_MUL] 7 6 1 [OP_SUB] [OP_MUL] [OP_SUB] 30 [OP_MUL]
var_a = 30
var_b = 6
var_c = var_a * var_b
var_d = 7
var_e = 6
var_f = 1
var_g = var_e - var_f
var_h = var_d * var_g
var_i = var_c - var_h
var_j = 30
var_k = var_i * var_j
print(int(var_k))