from functools import reduce
N = int(input())
sev = []
f = 0
q = N//7
r = N%7
while f == 0:
	if q == 0:
		sev.append(r)
		f = 1
	else:
		sev.append(r)
		r = q%7
		q = q//7
sev.reverse()
ans = int(reduce(lambda x, y: x + y, [str(x) for x in sev]))
print(ans)