import sys

# sys.setrecursionlimit(200005)
int1 = lambda x: int(x)-1
pDB = lambda *x: print(*x, end="\n", file=sys.stderr)
p2D = lambda x: print(*x, sep="\n", end="\n\n", file=sys.stderr)
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()

dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
inf = (1 << 63)-1
# inf = (1 << 31)-1
# md = 10**9+7
md = 998244353

n, m, k = LI()

if k==0:
    ans=[0]*n+[1]*m
    print(*ans,sep="")
    exit()

k += 1
l = k//2
r = k-l

if max(n, m) < r or min(n, m) < l:
    print(-1)
    exit()

if n >= r:
    ans = [0]*(n-r+1)+[1, 0]*(l-1)+[1]*(m-l+1)
    if k & 1: ans.append(0)
else:
    ans = [1, 0]*l+[1]*(m-l)

print(*ans, sep="")