import sys
sys.setrecursionlimit(10**6)


def ok(N, M, K):
    mn = 1 if M > 0 else 0
    mx = min(2*M, 2*N+1)
    return mn <= K <= mx


def s(N, M, K, L):
    if L == 0 and not ok(N, M, K):
        return None
    if L == 1 and not ok(M, N, K):
        return None
    arr = [L]
    for i in range(N+M):
        if N > 0 and ok(N-1, M, K - (L != 0)):
            arr.append(0)
            N -= 1
            K -= L != 0
            L = 0
        else:
            arr.append(1)
            M -= 1
            K -= L != 1
            L = 1
    return ''.join(map(str, arr))


def main():
    N, M, K = map(int, input().split())
    A = None
    if N > 0:
        A = s(N-1, M, K, 0)
    if M > 0 and A is None:
        A = s(N, M-1, K, 1)
    if A is None:
        print(-1)
    else:
        print(A)


if __name__ == '__main__':
    main()