1436번

N = int(input())
num = 666
count =0
while 1:
    if '666' in str(num):
        count+=1
    if count == N:
        print(num)
        break
    num+=1
        




"""
for i in range(5):
    for j in range(5):
        if i==0:
            if j==0:
                a.append(666)
            else:
                for k in range(10**j):
                    k = str(k)
                    a.append(int('666'+'0'*(j-len(k))+k))
        elif j==0:
            for k in range(10**(i-1),10**i):
                k = str(k)
                a.append(int(k+'666'))
        else:
            for p in range(10**(i-1),10**i):
                p=str(p)
                for q in range(10**j):
                    q=str(q)
                    a.append(int(p+'666'+'0'*(j-len(q))+q))
                    
a=list(set(a))
a.sort()
print(a[N-1])
"""