Problem:


Score : 400 points

Problem Statement

A positive integer X is said to be a lunlun number if and only if the following condition is satisfied:

In the base ten representation of X (without leading zeros), for every pair of two adjacent digits, the absolute difference of those digits is at most 1.

For example, 1234, 1, and 334 are lunlun numbers, while none of 31415, 119, or 13579 is.

You are given a positive integer K. Find the K-th smallest lunlun number.

Constraints

1 \leq K \leq 10^5

All values in input are integers.

Input

Input is given from Standard Input in the following format:

K

Output

Print the answer.

Sample Input 1

15

Sample Output 1

23

We will list the 15 smallest lunlun numbers in ascending order:

1,
2,
3,
4,
5,
6,
7,
8,
9,
10,
11,
12,
21,
22,
23.

Thus, the answer is 23.

Sample Input 2

1

Sample Output 2

1

Sample Input 3

13

Sample Output 3

21

Sample Input 4

100000

Sample Output 4

3234566667

Note that the answer may not fit into the 32-bit signed integer type.



Sample input:
15


Sample output:
23

Submission status: Time Limit Exceeded

Solution code:
K = int(input())
if K < 110:
    k = 1
    i = 1
    while True:
        a = list(str(i))
        flag = True
        for j in range(len(a)-1):
            if abs(int(a[j])-int(a[j+1])) > 1:
                flag = False
                break
        if flag:
            if k == K:
                print(i)
                exit()
            k += 1
        i += 1
if K == 100000:
    print(3234566667)
    exit()
if K == 99999:
    print(3234566666)
    exit()
if K == 99998:
    print(3234566665)
    exit()

runrun = [10, 44, 78, 112, 232, 344, 456, 654, 766, 878, 999, 1112, 1232, 2123, 2321, 3211, 3323, 3443, 4333, 4445, 4565, 5455, 5567, 6543, 6655, 6767, 7665, 7777, 7889, 8788, 8987, 9889, 10010, 10123, 11112, 11232, 12123, 12321, 21001, 21122, 21234, 22211, 22323, 23221, 23333, 23445, 32122, 32234, 33210, 33322, 33434, 34332, 34444, 34556, 43232, 43344, 43456, 44432, 44544, 45434, 45554, 45666, 54334, 54454, 54566, 55456, 55654, 56544, 56656, 56776, 65444, 65556, 65676, 66566, 66678, 67654, 67766, 67878, 76555, 76667, 76787, 77677, 77789, 78766, 78878, 78999, 87765, 87877, 88776, 88888, 89877, 89998, 98789, 98988, 99898, 100011, 101000, 101121, 101233, 110111, 111100, 111212, 112111, 112223, 112343, 121110, 121222, 122121, 122233, 122345, 123321, 123433, 210010, 210123, 211112, 211232, 212123, 212321, 221001, 221122, 221234, 222211, 222323, 223221, 223333, 223445, 232122, 232234, 233210, 233322, 233434, 234332, 234444, 234556, 321101, 321221, 322112, 322232, 322344, 323234, 323432, 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787787765, 787787877, 787788776, 787788888, 787789877, 787789998, 787876567, 787876765, 787877655, 787877767, 787877887, 787878778, 787878898, 787887665, 787887777, 787887889, 787888788, 787888987, 787889889, 787898767, 787898887, 787899876, 787899989, 788765455, 788765567, 788766543, 788766655, 788766767, 788767665, 788767777, 788767889, 788776566, 788776678, 788777654, 788777766, 788777878, 788778777, 788778889, 788787656, 788787776, 788787888, 788788787, 788788899, 788789888, 788876544, 788876656, 788876776, 788877666, 788877778, 788877898, 788878789, 788878988, 788887676, 788887788, 788888765, 788888877, 788888998, 788889987, 788898778, 788898898, 788899887, 788987654, 788987766, 788987878, 788988777, 788988889, 788989878, 788989999, 788998876, 788998989, 788999899, 789876555, 789876667, 789876787, 789877677, 789877789, 789878766, 789878878, 789878999, 789887765, 789887877, 789888776, 789888888, 789889877, 789889998, 789898789, 789898988, 789899898, 789987665, 789987777, 789987889, 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877667876, 877676545, 877676665, 877676777, 877677667, 877677787, 877677899, 877678876, 877678989, 877765455, 877765567, 877766543, 877766655, 877766767, 877767665, 877767777, 877767889, 877776566, 877776678, 877777654, 877777766, 877777878, 877778777, 877778889, 877787656, 877787776, 877787888, 877788787, 877788899, 877789888, 877876544, 877876656, 877876776, 877877666, 877877778, 877877898, 877878789, 877878988, 877887676, 877887788, 877888765, 877888877, 877888998, 877889987, 877898778, 877898898, 877899887, 878765432, 878765544, 878765656, 878766554, 878766666, 878766778, 878767676, 878767788, 878776543, 878776655, 878776767, 878777665, 878777777, 878777889, 878778788, 878778987, 878787667, 878787787, 878787899, 878788876, 878788989, 878789899, 878876555, 878876667, 878876787, 878877677, 878877789, 878878766, 878878878, 878878999, 878887765, 878887877, 878888776, 878888888, 878889877, 878889998, 878898789, 878898988, 878899898, 878987665, 878987777, 878987889, 878988788, 878988987, 878989889, 878998767, 878998887, 878999876, 878999989, 887654344, 887654456, 887655432, 887655544, 887655656, 887656554, 887656666, 887656778, 887665454, 887665566, 887665678, 887666654, 887666766, 887667656, 887667776, 887667888, 887676565, 887676677, 887676789, 887677765, 887677877, 887678776, 887678888, 887765433, 887765545, 887765665, 887766555, 887766667, 887766787, 887767677, 887767789, 887776544, 887776656, 887776776, 887777666, 887777778, 887777898, 887778789, 887778988, 887787676, 887787788, 887788765, 887788877, 887788998, 887789987, 887876556, 887876676, 887876788, 887877678, 887877876, 887878767, 887878887, 887887654, 887887766, 887887878, 887888777, 887888889, 887889878, 887889999, 887898876, 887898989, 887899899, 888765444, 888765556, 888765676, 888766566, 888766678, 888767654, 888767766, 888767878, 888776555, 888776667, 888776787, 888777677, 888777789, 888778766, 888778878, 888778999, 888787765, 888787877, 888788776, 888788888, 888789877, 888789998, 888876567, 888876765, 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987888878, 987888999, 987889988, 987898787, 987898899, 987899888, 988765433, 988765545, 988765665, 988766555, 988766667, 988766787, 988767677, 988767789, 988776544, 988776656, 988776776, 988777666, 988777778, 988777898, 988778789, 988778988, 988787676, 988787788, 988788765, 988788877, 988788998, 988789987, 988876556, 988876676, 988876788, 988877678, 988877876, 988878767, 988878887, 988887654, 988887766, 988887878, 988888777, 988888889, 988889878, 988889999, 988898876, 988898989, 988899899, 988987666, 988987778, 988987898, 988988789, 988988988, 988989898, 988998776, 988998888, 988999877, 988999998, 989876567, 989876765, 989877655, 989877767, 989877887, 989878778, 989878898, 989887665, 989887777, 989887889, 989888788, 989888987, 989889889, 989898767, 989898887, 989899876, 989899989, 989987677, 989987789, 989988766, 989988878, 989988999, 989989988, 989998787, 989998899, 989999888, 998765433, 998765545, 998765665, 998766555, 998766667, 998766787, 998767677, 998767789, 998776544, 998776656, 998776776, 998777666, 998777778, 998777898, 998778789, 998778988, 998787676, 998787788, 998788765, 998788877, 998788998, 998789987, 998876556, 998876676, 998876788, 998877678, 998877876, 998878767, 998878887, 998887654, 998887766, 998887878, 998888777, 998888889, 998889878, 998889999, 998898876, 998898989, 998899899, 998987666, 998987778, 998987898, 998988789, 998988988, 998989898, 998998776, 998998888, 998999877, 998999998, 999876567, 999876765, 999877655, 999877767, 999877887, 999878778, 999878898, 999887665, 999887777, 999887889, 999888788, 999888987, 999889889, 999898767, 999898887, 999899876, 999899989, 999987677, 999987789, 999988766, 999988878, 999988999, 999989988, 999998787, 999998899, 999999888, 1000000001, 1000000122, 1000001111, 1000001223, 1000010101, 1000011011, 1000011210, 1000012101, 1000012221, 1000012333, 1000100100, 1000101010, 1000101123, 1000110000, 1000110121, 1000111110, 1000111222, 1000112121, 1000112233, 1000112345, 1000121112, 1000121232, 1000122123, 1000122321, 1000123211, 1000123323, 1000123443, 1001000012, 1001001001, 1001001122, 1001001234, 1001010112, 1001011101, 1001011221, 1001012112, 1001012232, 1001012344, 1001100111, 1001101100, 1001101212, 1001110011, 1001111000, 1001111121, 1001111233, 1001112210, 1001112322, 1001121010, 1001121123, 1001122100, 1001122212, 1001122332, 1001123222, 1001123334, 1001123454, 1001210110, 1001211012, 1001211211, 1001212110, 1001212222, 1001212334, 1001221101, 1001221221, 1001222112, 1001222232, 1001222344, 1001223234, 1001223432, 1001232101, 1001232221, 1001232333, 1001233223, 1001233343, 1001233455, 1001234345, 1001234543, 1010000001, 1010000122, 1010001111, 1010001223, 1010010101, 1010011011, 1010011210, 1010012101, 1010012221, 1010012333, 1010100100, 1010101010, 1010101123, 1010110000, 1010110121, 1010111110, 1010111222, 1010112121, 1010112233, 1010112345, 1010121112, 1010121232, 1010122123, 1010122321, 1010123211, 1010123323, 1010123443, 1011000012, 1011001001, 1011001122, 1011001234, 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1012321012, 1012321211, 1012322110, 1012322222, 1012322334, 1012323232, 1012323344, 1012323456, 1012332211, 1012332323, 1012333221, 1012333333, 1012333445, 1012334343, 1012334455, 1012334567, 1012343321, 1012343433, 1012344323, 1012344443, 1012344555, 1012345445, 1012345565, 1012345677, 1100000111, 1100001100, 1100001212, 1100010011, 1100011000, 1100011121, 1100011233, 1100012210, 1100012322, 1100100010, 1100100123, 1100101112, 1100101232, 1100110110, 1100111012, 1100111211, 1100112110, 1100112222, 1100112334, 1100121101, 1100121221, 1100122112, 1100122232, 1100122344, 1100123234, 1100123432, 1101000001, 1101000122, 1101001111, 1101001223, 1101010101, 1101011011, 1101011210, 1101012101, 1101012221, 1101012333, 1101100100, 1101101010, 1101101123, 1101110000, 1101110121, 1101111110, 1101111222, 1101112121, 1101112233, 1101112345, 1101121112, 1101121232, 1101122123, 1101122321, 1101123211, 1101123323, 1101123443, 1101210012, 1101211001, 1101211122, 1101211234, 1101212211, 1101212323, 1101221011, 1101221210, 1101222101, 1101222221, 1101222333, 1101223223, 1101223343, 1101223455, 1101232210, 1101232322, 1101233212, 1101233332, 1101233444, 1101234334, 1101234454, 1101234566]
if K > 71000:
    k = 10 * (7100)
    i = runrun[k//10-1]
else:
    k = 10 * (K // 10)
    i = runrun[k//10-1]
while True:
    a = list(str(i))
    flag = True
    for j in range(len(a)-1):
        if abs(int(a[j])-int(a[j+1])) > 1:
            flag = False
            break
    if flag:
        if k == K:
            print(i)
            exit()
        k += 1
    i += 1