import sys
from itertools import product

N = int(input())
count = 0
for i in range(25):
    for j in range(10000000):
        a = bin(j)[2:]
        if len(a)>i+1:
            break
        a = '0'*(i+1-len(a))+a
        n = a.replace('0', '3').replace('1', '5')
        x = ''.join(n)
        x = int(x)
        if x%15==0:
            count += 1
            if count==N:
                print(x)
                sys.exit()