EastWest, NorthSouth, Length = [int(input()) for _ in range(3)]
i = 0

if EastWest < 0:
    i += 1
if NorthSouth < 0:
    i += 1
L = Length

while L < EastWest:
    L += L
    i += 1

if EastWest - L != 0:
    i += 1

L = Length

while L < NorthSouth:
    L += L
    i += 1

if NorthSouth - L != 0:
    i += 1

print(i)