N = int(input())

def sfb(n):
    xs = str(n)
    for x in xs:
        if x != '3' and x != '5':
            return False
    return True

def solve():
    s = 0    
    c = 0
    n = 37
    while True:
        s = n * 15
        if sfb(s):
            c = c + 1
            if c == N:
                return s
        n = n + 10
        
print(solve())