v = 0
w = 0
x = Uniform(-9, 7)
y = Uniform(-7, 9)
s = 0
f = 0
while true:
    v = Uniform(-3, 5)
    w = Uniform(-6, 10)
    f = Bernoulli(3/4)
    x = x + f*v
    y = y + f*w
    s = x + y
end