import sys
# input = sys.stdin.readline
#input = sys.stdin.buffer.readline #文字列はダメ
#sys.setrecursionlimit(1000000)
import math
import bisect
#import itertools
#import random
#from heapq import heapify, heappop, heappush
from collections import defaultdict
from collections import deque
import copy #DeepCopy: hoge = [_[:] for _ in hogehoge]
#from functools import lru_cache
#@lru_cache(maxsize=None)
#MOD = pow(10,9) + 7
# MOD = 998244353
dx = [1,0,-1,0]
dy = [0,1,0,-1]
#dx8 = [1,1,0,-1,-1,-1,0,1]
#dy8 = [0,1,1,1,0,-1,-1,-1]

def main():
    N,M,K = map(int,input().split())
    if N == M:
        mx = N+M-1        
    else:
        mx = min(N,M) * 2
    if mx < K:
        print(-1)
        exit()
    
    block0 = [[] for _ in range(K+1)]
    # 0 start
    N0 = N; M0 = M
    zero = True
    for i in range(K+1):
        if i%2 == 0:
            if N0 > 0:
                block0[i].append('0')
                N0 -= 1
            else:
                zero = False
                break
        else:
            if M0 > 0:
                block0[i].append('1')
                M0 -= 1
            else:
                zero = False
                break
    if zero:
        for _ in range(N0):
            block0[0].append('0')
        if (K+1)%2 == 0: #最後が1
            for _ in range(M0):
                block0[-1].append('1')
        else:
            if (K+1)%2 == 1 and K+1 >= 2:
                for _ in range(M0):
                    block0[-2].append('1')
        block0 = ["".join(block0[i]) for i in range(K+1)]
        z = "".join(block0)
    
    N1 = N; M1 = M
    one = True
    block1 = [[] for _ in range(K+1)]
    for i in range(K+1):
        if i%2 == 0:
            if M1 > 0:
                block1[i].append('1')
                M1 -= 1
            else:
                one = False
                break
        else:
            if N1 > 0:
                block1[i].append('0')
                N1 -= 1
            else:
                one = False
                break
    if one:
        if K+1 >= 2:
            for _ in range(N1):
                block1[1].append('0')
        if (K+1)%2 == 1:
            for _ in range(M1):
                block1[-1].append('1')
        elif K+1 >= 2:
            for _ in range(M1):
                block1[-2].append('1')
        block1 = ["".join(block1[i]) for i in range(K+1)]
        o = "".join(block1)
    
    if zero and one:
        print(min(z,o))
    elif zero:
        print(z)
    elif one:
        print(o)
    else:
        print(-1)
        

    



if __name__ == '__main__':
    main()