from math import log2
d = int(input())
ans = d
for k in range(65):
    l, r = 0, d
    while r - l > 1:
        mid = (l + r) // 2
        s = 0
        x = int(str(mid))
        for i in range(k):
            s += x
            x //= 2
        if s >= d:
            r = mid
        else:
            l = mid
    s = 0
    x = int(str(r))
    for i in range(k):
        s += x
        x //= 2
    if s == d:
        ans = min(ans, r)
print(ans)