#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll=long long;
using ld=long double;
ld pie=3.141592653589793;
ll inf=1444440099999944;
ll mod=1000000007;
int main(){
    ll n,m,k;
    cin >> n >> m >> k;
    if (min(n,m)<k)
    {
        cout << -1 << endl;
        return 0;
    }
    if (n==0)
    {
        string s;
        for (ll i = 0; i < m; i++)
        {
            s.push_back('1');
        }
        cout << s << endl;
        return 0;
    }else if (m==0)
    {
        string s;
        for (ll i = 0; i < n; i++)
        {
            s.push_back('0');
        }
        cout << s << endl;
        return 0;
    }
    ll z=0,o=1;
    string s="1";
    for (ll i = 0; i < k; i++)
    {
        if (s[i]=='1')
        {
            s.push_back('0');
            z+=1;
        }else{
            s.push_back('1');
            o+=1;
        }
    }
    for (ll i = 0; i < n-z; i++)
    {
        s.push_back('0');
    }
    reverse(s.begin(),s.end());
    for (ll i = 0; i < m-o; i++)
    {
        s.push_back('1');
    }
    cout << s << endl;
}