def main():
    K = int(input())
    s = [2,3,5 ,7, 11, 13]
    g = [4,6,8,9,10,12]
    count = 0
    for x in s:
        if K/x in g:
            count += 1
    print(count/36)
        
        
if __name__ == '__main__':
    main()