4549.sagews

n = 0
total = 0
for k in range (10000):
    n = 3*k
    if n < 10000:
        if 0 == n%5:
            total += n
print total

3331665

base = 3
total = 0
for x in range (10000):
    if base*x <10000:
        total =+ base*x
print total

9999

133346664