#!/usr/bin/env python3

# closed form expression, d = digits
# if d is even: 20 * 30**(d/2 - 1)
# if d = 3+4n : 5 * 20**((d+1)/4) * 25**((i-3)/4)
# iterate all digits in range

def main(d): #inclusive
    r = 0
    for i in range(2,d+1,2):
        r += 20*30**(i//2 - 1)
    for i in range(3,d+1,4):
        r += 5 * 20**((i+1)//4) * 25**((i-3)//4)
    return r

print(main(9))