from math import log2, floor


def count_tap(sum_: int) -> int:
    init_tap_num = floor(log2(sum_))
    if (sum_ - 2**init_tap_num) == 0:
        return init_tap_num

    return init_tap_num + 1


def main():
    N = int(input())
    print(count_tap(N))


if __name__ == "__main__":
    main()