import sys
input = sys.stdin.readline

N,M,K=map(int,input().split())

z=K//2+1
o=(K+1)//2

if N>=z and M>=o:
    ANS=[0]
    for i in range(K):
        ANS.append(ANS[-1]^1)

    rest_0=N-ANS.count(0)
    rest_1=M-ANS.count(1)

    for i in range(len(ANS)):
        if ANS[i]==0:
            ANS=ANS[:i]+[0]*rest_0+ANS[i:]
            break

    for i in range(len(ANS)-1,-1,-1):
        if ANS[i]==1:
            ANS=ANS[:i]+[1]*rest_1+ANS[i:]
            break

    if ANS.count(0)==N and ANS.count(1)==M:
        print("".join(map(str,ANS)))
        exit()

    
o=K//2+1
z=(K+1)//2

if N>=z and M>=o:
    ANS=[1]
    for i in range(K):
        ANS.append(ANS[-1]^1)

    rest_0=N-ANS.count(0)
    rest_1=M-ANS.count(1)

    for i in range(len(ANS)):
        if ANS[i]==0:
            ANS=ANS[:i]+[0]*rest_0+ANS[i:]
            break

    for i in range(len(ANS)-1,-1,-1):
        if ANS[i]==1:
            ANS=ANS[:i]+[1]*rest_1+ANS[i:]
            break

    if ANS.count(0)==N and ANS.count(1)==M:
        print("".join(map(str,ANS)))
        exit()

print(-1)