n=input().strip()
if not n.isdigit():
print("Invalid input")
exit()
n=int(n)
if n<=0
print("Invalid input")
exit()
res = []
while n >0
if n%2==1:
res.append('3')
else:
res.append('4')
n=(n-1)//2
print(''.join(res[::-1]))