import sys


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    n = int(input())
    p = n / 10000
    n = 1 - p
    tp = 0.99 * p
    fn = 0.01 * p
    tn = 0.99 * n
    fp = 0.01 * n
    return 100 * fp / (fp + tp)


if __name__ == '__main__':
    ret = main()
    if ret is not None:
        print(ret)