import sys
from collections import deque
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
INF = 2**63-1
mod = 998244353
n, m, k = mi()
assert 0 <= n <= 10 ** 5 and 0 <= m <= 10 ** 5 and 0 <= k <= 10 ** 5 and n + m >= 1
ans = '2'
#WA
#0101...型

s1 = deque(['0'])
cnt0 = 1
cnt1 = 0
for i in range(k):
    if  i % 2 == 0:
        cnt1 += 1
        s1.append('1')
    else:
        cnt0 += 1
        s1.append('0')
if cnt0 <= n and cnt1 <= m:
    while cnt0 < n:
        if s1 and s1[0] == '1':
            t = s1.popleft()
            s1.appendleft('0')
            s1.appendleft(t)
        else:
            s1.appendleft('0')
        cnt0 += 1
    while cnt1 < m:
        if s1 and s1[-1] == '0':
            t = s1.pop()
            s1.append('1')
            s1.append(t)
        else:
            s1.append('1')
        cnt1 += 1
    ans = min(ans, ''.join(s1))
if ans == '2':
    print(-1)
else:
    print(ans)