def max_folds(val_mm, initial_h):
    a = 0
    current_val = val_mm * 1.0
    current_h = initial_h * 1.0
    while current_val > current_h:
        a += 1
        current_val /= 2.0
        current_h *= 2.0
    return a

x, y, h = map(int, input().split())

# Case 1: Fold x first, then y
a = max_folds(x * 1000, h)
h_new_x = h * (2 ** a)
b = max_folds(y * 1000, h_new_x)
total1 = a + b

# Case 2: Fold y first, then x
b_initial = max_folds(y * 1000, h)
h_new_y = h * (2 ** b_initial)
a_initial = max_folds(x * 1000, h_new_y)
total2 = b_initial + a_initial

print(max(total1, total2))