Python Dice v2

import random
print "Δώσε πλήθος ζαριών"
a=int(input())
i=0
stat = [0,0,0,0,0,0,0,0,0,0,0,0]
while i<a:
    z1=random.randint(1,6)
    z2=random.randint(1,6)
    add=z1+z2
    stat[z1-1]=stat[z1-1]+1
    stat[z2-1]=stat[z2-1]+1
    stat[add-1]=stat[add-1]+1
    i=i+1
print stat