# K=1なら000000111
# K=3なら00000101111
# K=5なら0000010101111
# K=2なら00000111110
# K=4なら000001011110

N, M, K = map(int, input().split())
if N == M:
    K_max = N*2-1
else:
    K_max = min(N, M)*2
if K > K_max or K == 0:
    print(-1)
    exit()

# 後ろから決めていく
ans_rev = ''
N_remainder = N
M_remainder = M
K_remainder = K
if K_remainder%2 == 1:
    M_use = M_remainder-(K_remainder-1)//2
    ans_rev += '1'*M_use
    M_remainder -= M_use
    K_remainder -= 1
elif K_remainder == N*2:
    M_use = max(0, M_remainder-N)
    ans_rev += '1'*M_use
    M_remainder -= M_use
    K_remainder -= 1    
#print(ans_rev, N_remainder, M_remainder, K_remainder)
    
for k in range(K_remainder//2):
    ans_rev += '0'
    N_remainder -= 1
    M_use = M_remainder-(K_remainder-1)//2
    ans_rev += '1'*M_use
    M_remainder -= M_use
    K_remainder -= 1
    #print(ans_rev, N_remainder, M_remainder, K_remainder)
    
if N_remainder > 0:
    ans_rev += '0'*N_remainder
    N_remainder = 0
#print(ans_rev, N_remainder, M_remainder, K_remainder)

if M_remainder > 0:
    ans_rev += '1'*M_remainder
    M_remainder = 0
#print(ans_rev, N_remainder, M_remainder, K_remainder)

print(ans_rev[::-1])