class X:
    def __init__(self, a, b, c):
        self.a = a
        self.b = b
        self.c = c
    def i(self, j): #Produto interno
        return self.a * j.a + self.b * j.b + self.c * j.c
    def __mul__(self, m): #mul por escalar
        return X(self.a * m, self.b * m, self.c * m)
    def __add__(self, j):
        return X(self.a + j.a, self.b + j.b, self.c + j.c)
    def __repr__(self):
        return 'Vetor: ' + str(self.a)+ ', ' + str(self.b) + ', ' + str(self.c) +'.'
    def x(self, j):
        valor1 = self.i(j)
        valor2 = self.i(self)
        return self * (valor1/valor2)

from random import seed
from random import random
seed(614)
x1 = []
x2 = []
x3 = []

for n in range(916):
    x1.append(X(random(), random(), random()))
    x2.append(X(random(), random(), random()))

print(x1[0].i(x2[0]))

for j in range(len(x1)):
    valor = x1[j].x(x2[j])
    x3.append(valor)

x4 = x3[111:759]

vetorSoma = X(0,0,0)
for i in range(len(x4) -1):
    vetorSoma += x4[i] + x4[i+1]

print(vetorSoma)